JS遮罩效果 （很强）

//<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
/*
| -------------------------------------------------------------------
| Dialog 浮动提示框 发布版本3 【功能说明】
| -------------------------------------------------------------------
| 支持浏览器 FF, IE, OP
| 支持拖动，自定义标题，宽度，高度，内容。
| 自定义按钮是否显示，确定，取消，关闭。
| 支持打开新窗口，支持嵌入网页。
| IE,下对Select完整遮罩
|
| -------------------------------------------------------------------
| Dialog 浮动提示框 发布版本3 【使用方法】
| -------------------------------------------------------------------
| 在需要使用的页面中，最下面</body>前加入脚本
| <script type="text/javascript">new dialog().init();</script>
| 目前暂时只能这么做，背景遮罩将失去效果
|
| 调用提示框的脚本是 new dialog().event();
|
*/

//检测浏览器
var userAgent = navigator.userAgent.toLowerCase();
var is_opera = userAgent.indexOf('opera') != -1 && opera.version();
var is_moz = (navigator.product == 'Gecko') && userAgent.substr(userAgent.indexOf('firefox') + 8, 3);
var is_ie = (userAgent.indexOf('msie') != -1 && !is_opera) && userAgent.substr(userAgent.indexOf('msie') + 5, 3);

function dialog(){
//设置提示框默认标题,宽度，高度，边框颜色
var title = '系统提示信息';
var width = 520;
var height = 320;
var bodercolor = "#000";

//设置提示框标题 背景颜色，字体颜色，字体形状
var titlebgcolor = "#DAf998";
var titlefontcolor = "#666";
var titlefontweight = "bold";

//设置提示框内容 背景颜色，字体颜色
var bodybgcolor = "#fff";
var bodyfontcolor = "#000";

//默认阴影颜色,透明度(0-100),阴影宽度，高度
var ShadowColor = "#000";
var ShadowOpacity = 60;
var ShadowWdith = 6;
var ShadowHeight = 6;

//背景遮罩层,最小透明度(0-100)、最大透明度(0-100)、增加减少数(0-100),运行速度(1000=1秒)
var ScreenOverSwitch = 1;
var ScreenOverBgColor = "#7799ff";
var ScreenOverOpacityMin = 0;
var ScreenOverOpacityMax = 40;
var ScreenOverOpacitySpeed = 5;
var ScreenOverOpacitySleep = 50;

//图片浏览盒最小宽度、高度
var ImageViewBoxWidthMin = 500;
var ImageViewBoxHeightMin = 500;

//页面默认滚动条状态
var bodyoverflow = "hidden";

//展示图片状态
var zoomobj = Array()

//默认按钮 设置（确认，取消）
var sFunc = '<input id="dialogOk" type="button" style="background:#fff;width:60px;height:20px;border:#000 1px solid;line-height:20px;" value="确认" onclick="new dialog().reset();" /> <input id="dialogCancel" type="button" style="background:#fff;width:60px;height:20px;border:#000 1px solid;line-height:20px;" value="取消" onclick="new dialog().reset();" /> ';

//默认关闭按钮
var sClose = '<input type="image" id="dialogBoxClose" onclick="new dialog().reset();" src="images/CloseOut.gif" border="0" width="17" height="17" onmouseover="this.src=/'CloseOver.gif/';" onmouseout="this.src=/'images/CloseOut.gif/';" align="absmiddle" />';

//设置初始提示框内容
var sBody = '/
<table id="dialogBodyBox" border="0" align="center" cellpadding="0" cellspacing="0">/
<tr height="10"><td colspan="4"></td></tr>/
<tr>/
<td width="10"></td>/
<td id="dialogMsg" style="font-size:12px;color:'+bodyfontcolor+';"></td>/
<td width="10"></td>/
</tr>/
<tr height="10"><td colspan="3" align="center"></td></tr>/
<tr><td id="dialogFunc" colspan="3" align="center">' + sFunc + '</td></tr>/
<tr height="10"><td colspan="3" align="center"></td></tr>/
</table>/
';

//设置初始提示框框架
var sBox = '/
<table id="dialogBox" width="' + width + '" border="0" cellpadding="0" cellspacing="0" style="border:1px solid '+bodercolor+';display:none;z-index:100;">/
<tr height="1" style="background:#fff;"><td></td></tr>/
<tr height="25" style="background:'+titlebgcolor+';">/
<td>/
<table onselectstart="return false;" style="-moz-user-select:none;" width="100%" border="0" cellpadding="0" cellspacing="0">/
<tr>/
<td width="6"></td>/
<td id="dialogBoxTitle" onmousedown="new dialog().moveStart(event, /'dialogBox/')" style="color:'+titlefontcolor+';cursor:move;font-size:12px;font-weight:'+titlefontweight+';">'+title+'</td>/
<td id="dialogClose" width="27" align="right" valign="middle">/
' + sClose + '/
</td>/
<td width="6"></td>/
</tr>/
</table>/
</td>/
</tr>/
<tr id="dialogHeight" style="height:' + height + '">/
<td id="dialogBody" style="background:'+bodybgcolor+';color:'+bodyfontcolor+';">' + sBody + '</td>/
</tr>/
</table>/
<div id="dialogBoxHideImageViewBox" style="visibility:hidden;display:none!important;display:block;"><img id="HideImage" /></div>/
<div id="dialogBoxHideIFrame" style="display:block;z-index:98;"><iframe id="HideIFrame" src="about:blank" scrolling="no" frameborder="0" style="width:100%;height:100%;"></iframe></div>/
<div id="dialogBoxShadow" style="display:block;z-index:99;"><iframe id="ShadowHideIFrame" src="about:blank" scrolling="no" frameborder="0" style="width:100%;height:100%;"></div>/
';

//自定义$函数，方便使用 document.getElementById()
//参数一(_sId)：对象ID名称
function $(_sId){return document.getElementById(_sId)}

//显示提示框
//无参数
this.show = function(){
//判断提示框是否存在，不存在则初始化
$('dialogBodyBox') ? function(){} : this.init();

if(ScreenOverSwitch){
//显示背景遮罩
this.showSO();
}else{
this.showSO(1,1);
}

//显示提示框
this.middle('dialogBox');

//显示提示框阴影
this.shadow();
}

//重置提示框内容，隐藏遮罩
//无参数
this.reset = function(){
//关闭提示框
$('dialogBox').style.display='none';

//关闭阴影
$('dialogBoxShadow').style.display = "none";

//关闭IE屏蔽,用来屏蔽SELECT
$('dialogBoxHideIFrame').style.display = "none";

//初始化提示框内容
$('dialogBody').innerHTML = sBody;

if(ScreenOverSwitch){
//隐藏背景遮罩
this.hideSO();
}else{
this.hideSO(1,1);
}

//设置提示框按钮，1显示，0隐藏
$('dialogOk').style.display = 'block';
$('dialogCancel').style.display = 'block';
$('dialogBoxClose').style.display = 'block';
}

//设置提示框内容,刷新提示框
//参数一(_sHtml)：提示框内容可以是HTML
this.html = function(_sHtml){
//设置提示框内容
$("dialogBody").innerHTML = _sHtml;

//显示提示框(重复使用，等于刷新)
this.show();
}

//初始化提示框
//无参数
this.init = function(){
//检测是否存在提示框容器，存在则移除
$('dialogCase') ? $('dialogCase').parentNode.removeChild($('dialogCase')) : function(){};

//创建提示框容器
var oDiv = document.createElement('span');

//设置容器ID
oDiv.id = "dialogCase";

//放入提示框框架
oDiv.innerHTML = sBox;

//将容器+如页面
document.body.appendChild(oDiv);

//重置提示框内容
this.reset();
}

//显示提示框阴影
//无参数
this.shadow = function(){
//获取阴影层属性
var oShadow = $('dialogBoxShadow');

//获取提示框属性
var oDialog = $('dialogBox');

//获取IE屏蔽层属性
var oIFrame = $('dialogBoxHideIFrame');

//设置阴影属性
oShadow['style']['position'] = "absolute";
oShadow['style']['background'] = ShadowColor;
oShadow['style']['display'] = "";
oShadow['style']['opacity'] = parseInt(ShadowOpacity)/100;
oShadow['style']['filter'] = "alpha(opacity="+ShadowOpacity+")";
oShadow['style']['top'] = oDialog.offsetTop + ShadowHeight + "px";
oShadow['style']['left'] = oDialog.offsetLeft + ShadowWdith + "px";
oShadow['style']['width'] = oDialog.offsetWidth + "px";
oShadow['style']['height'] = oDialog.offsetHeight + "px";

//设置IE屏蔽层属性
oIFrame['style']['display'] = "";
oIFrame['style']['position'] = "absolute";
oIFrame['style']['top'] = oDialog.offsetTop + "px";
oIFrame['style']['left'] = oDialog.offsetLeft + "px";
oIFrame['style']['width'] = oDialog.offsetWidth + "px";
oIFrame['style']['height'] = oDialog.offsetHeight + "px";

//设置阴影层背景颜色
var editor;
editor = $("ShadowHideIFrame").contentWindow;

// 针对IE浏览器, 可编辑
editor.document.designMode = 'on';
editor.document.contentEditable = true;

// 兼容 FireFox, 打开并写入
editor.document.open();
editor.document.writeln('<body style="background:'+ShadowColor+';margin:0px;"></body>');
editor.document.close();
}

//嵌入打开网页
//参数一(_sUrl)： 嵌入网页地址
//参数二(_sMode)：滚动条模式（值: no, yes, auto）
//参数三()： 提示框标题
//参数四()： 提示框宽度
//参数五()： 提示框高度
this.open = function(_sUrl, _sMode){
//获取隐藏参数内容，标题，宽度，高度，如果空，则使用默认
var _sTitle=arguments[2]?arguments[2]:title;
var _sWidth=arguments[3]?arguments[3]:width;
var _sHeight=arguments[4]?arguments[4]:height;

//设置提示框属性
this.set('title',_sTitle);
this.set('width',_sWidth);
this.set('height',_sHeight);

//显示提示框
this.show();

//嵌入网页
$("dialogBody").innerHTML = "<iframe id='dialogFrame' width='"+_sWidth+"' height='"+_sHeight+"' frameborder='0' scrolling='" + _sMode + "'></iframe>";

//设置网页地址
$("dialogFrame").src = _sUrl;
}

//打开新窗口(居中且只有标题栏，不含工具栏，菜单栏等)
//参数一(_sUrl)： 网页地址
//参数一(_iWidth)： 窗口宽度
//参数一(_iHeight)：窗口高度
//参数四(_sMode)： 滚动条模式（值: no, yes, auto）
this.showWindow = function(_sUrl, _iWidth, _iHeight, _sMode){
var oWindow;
//获取窗口居中位置
var sLeft = (screen.width) ? (screen.width - _iWidth)/2 : 0;
var sTop = (screen.height) ? (screen.height - _iHeight)/2 : 0;

//打开新窗口
oWindow = window.open(_sUrl, '', 'height=' + _iHeight + ', width=' + _iWidth + ', top=' + sTop + ', left=' + sLeft + ', toolbar=no, menubar=no, scrollbars=' + _sMode + ', resizable=no,location=no, status=no');
}

//调用提示框
//参数一(_sMsg)： 提示信息
//参数二(_sOk)： 是否显示“确认”按钮(显示：1，不显示:0)
//参数三(_sCancel)：是否显示“取消”按钮(显示：1，不显示:0)
//参数四(_sClose)： 是否显示“关闭”按钮(显示：1，不显示:0)
//参数五()： 提示框标题
//参数六()： 提示框宽度
//参数七()： 提示框高度
this.event = function(_sMsg, _sOk, _sCancel, _sClose){
//写入 确认，取消按钮
$('dialogFunc').innerHTML = sFunc;

//写入 关闭按钮
$('dialogClose').innerHTML = sClose;

//如果提示信息层不存在，则写入提示信息层
$('dialogBodyBox') == null ? $('dialogBody').innerHTML = sBody : function(){};

//写入提示信息
$('dialogMsg') ? $('dialogMsg').innerHTML = _sMsg : function(){};

//获取隐藏参数内容，标题，宽度，高度，如果空，则使用默认
var _sTitle=arguments[4]?arguments[4]:title;
var _sWidth=arguments[5]?arguments[5]:width;
var _sHeight=arguments[6]?arguments[6]:height;

//设置提示框
this.set('title',_sTitle);
this.set('width',_sWidth);
this.set('height',_sHeight);

//设置提示框按钮，1显示，0隐藏
_sOk ? $('dialogOk').focus() : $('dialogOk').style.display = 'none';
_sCancel ? function(){} : $('dialogCancel').style.display = 'none';
_sClose ? function(){} : $('dialogBoxClose').style.display = 'none';

//显示提示框
this.show();
}

//嵌入打开网页
//参数一(_sImage)： 图片ID
//参数二()： 图片名称
this.imageview = function(_sImage){
$("HideImage").src = _sImage.src;

//获取隐藏参数内容，标题，宽度，高度，如果空，则使用默认
var _sTitle=arguments[1]?arguments[1]:" ";
var _sWidth=$("HideImage").width;
var _sHeight=$("HideImage").height;

if(_sHeight>document.body.clientHeight){
_sHeight = document.body.clientHeight-30-ShadowHeight;
}

//设置提示框属性
this.set('title',_sTitle);
this.set('width',_sWidth);
this.set('height',_sHeight);

//显示提示框
this.show();

//嵌入图片
$("dialogBody").innerHTML = '<img id="ViewImage" src="'+_sImage.src+'" height="'+_sHeight+'" />';
this.set('width',$("ViewImage").width);

//获取图片浏览最大值
zoomobj['zimginfo'] = [parseInt($("ViewImage").width), parseInt($("ViewImage").height)]

//检测浏览器，赋予滚轮事件
if(is_ie){
$('ViewImage').onmousewheel = this.imgzoom;
} else {
$('ViewImage').addEventListener("DOMMouseScroll", this.imgzoom, false);
}
}

//图片预览大小缩放
this.imgzoom = function(event){
//获取窗口事件
oEvent = window.event ? window.event : event;

//检测滚轮
if(oEvent.wheelDelta <= 0 || oEvent.detail > 0) {
if(parseInt($('ViewImage').height) <= parseInt(ImageViewBoxHeightMin)) {
$('ViewImage').height = parseInt(ImageViewBoxHeightMin);
}else{
$('ViewImage').height -= parseInt(zoomobj['zimginfo'][1] / 5);
}
} else {
if(parseInt($('ViewImage').height) >= parseInt(zoomobj['zimginfo'][1])) {
$('ViewImage').height = parseInt(zoomobj['zimginfo'][1]);
}else{
$('ViewImage').height += parseInt(zoomobj['zimginfo'][1] / 5);
}
}

//获取阴影层，提示框，提示框高度，IE遮罩层
var oShadow = $('dialogBoxShadow');
var oDialog = $('dialogBox');
var oHeight = $('dialogHeight');
var oHFrame = $('dialogBoxHideIFrame');

//重置提示框属性
oDialog['style']['width'] = parseInt($('ViewImage').width)+'px';
oHeight['style']['height'] = parseInt($('ViewImage').height)+'px';

//重置提示框位置
oDialog['style']['position'] = "absolute";
oDialog['style']['left'] = (document.body.clientWidth / 2) - (oDialog.offsetWidth / 2) + "px";
oDialog['style']['top'] = (document.body.clientHeight / 2 + document.body.scrollTop) - (oDialog.offsetHeight / 2) + "px";

//重置阴影位置
oShadow['style']['opacity'] = parseInt(ShadowOpacity)/100;
oShadow['style']['filter'] = "alpha(opacity="+ShadowOpacity+")";
oShadow['style']['top'] = parseInt(oDialog.offsetTop) + ShadowHeight + "px";
oShadow['style']['left'] = parseInt(oDialog.offsetLeft) + ShadowWdith + "px";
oShadow['style']['width'] = parseInt(oDialog.offsetWidth) + "px";
oShadow['style']['height'] = parseInt(oDialog.offsetHeight) + "px";

//重置IE屏蔽层位置
oHFrame['style']['left'] = parseInt(oDialog.offsetLeft) + "px";
oHFrame['style']['top'] = parseInt(oDialog.offsetTop) + "px";
oHFrame['style']['width'] = parseInt(oDialog.offsetWidth) + "px";
oHFrame['style']['height'] = parseInt(oDialog.offsetHeight) + "px";

}

//提示框设置
//参数一(_oAttr)： 设置项名称
//参数二(_sVal)： 设置内容
this.set = function(_oAttr, _sVal){

//获取阴影层，提示框，提示框高度，IE遮罩层
var oShadow = $('dialogBoxShadow');
var oDialog = $('dialogBox');
var oHeight = $('dialogHeight');
var oHFrame = $('dialogBoxHideIFrame')

//设置内容不为空
if(_sVal != ''){
//判断项名称
switch(_oAttr){
//设置标题
case 'title':
$('dialogBoxTitle').innerHTML = _sVal;
title = _sVal;
break;

//设置提示框宽
case 'width':
oDialog['style']['width'] = _sVal+'px';
width = _sVal;
break;

//设置提示框高
case 'height':
oHeight['style']['height'] = _sVal+'px';
height = _sVal;
break;

//设置遮罩层状态
case 'ScreenOverSwitch':
ScreenOverSwitch = _sVal;
break;

//设置提示框遮罩层颜色
case 'ScreenOverBgColor':
ScreenOverBgColor = _sVal;
break;

//设置阴影颜色
case 'shadowcolor':
oShadow['style']['background'] = _sVal;
//设置阴影层背景颜色
var editor;
editor = $("ShadowHideIFrame").contentWindow;

// 针对IE浏览器, 可编辑
editor.document.designMode = 'on';
editor.document.contentEditable = true;

// 兼容 FireFox, 打开并写入
editor.document.open();
editor.document.writeln('<body style="background:'+_sVal+';margin:0px;"></body>');
editor.document.close();
ShadowColor = _sVal;
break;

//设置阴影透明度
case 'shadowopacity':
ShadowOpacity = _sVal;
break;

//设置阴影宽度
case 'shadowwdith':
ShadowWdith = _sVal;
break;

//设置阴影高度
case 'shadowheight':
ShadowHeight = _sVal;
break;
}
}

//刷新提示框
this.middle('dialogBox');

//重置阴影位置
oShadow['style']['opacity'] = parseInt(ShadowOpacity)/100;
oShadow['style']['filter'] = "alpha(opacity="+ShadowOpacity+")";
oShadow['style']['top'] = oDialog.offsetTop + ShadowHeight + "px";
oShadow['style']['left'] = oDialog.offsetLeft + ShadowWdith + "px";
oShadow['style']['width'] = oDialog.offsetWidth + "px";
oShadow['style']['height'] = oDialog.offsetHeight + "px";

//重置IE屏蔽层位置
oHFrame['style']['left'] = oDialog.offsetLeft + "px";
oHFrame['style']['top'] = oDialog.offsetTop + "px";
oHFrame['style']['width'] = oDialog.offsetWidth + "px";
oHFrame['style']['height'] = oDialog.offsetHeight + "px";
}

//拖动提示框
//参数一(event)： 点击事件，使用的时候赋值event就可以
//参数二(_sId)： 拖动对象ID
this.moveStart = function (event, _sId){
//获取拖动对象
var oObj = $(_sId);

//赋予对象拖动操作
oObj.onmousemove = mousemove;
oObj.onmouseup = mouseup;

//捕获鼠标移动
oObj.setCapture ? oObj.setCapture() : function(){};

//获取窗口事件
var oEvent = window.event ? window.event : event;

//保留鼠标位置
var dragData = {x : oEvent.clientX, y : oEvent.clientY};

//保留对象位置
var backData = {x : parseInt(oObj.style.top), y : parseInt(oObj.style.left)};

//鼠标移动
function mousemove(event){
//获取窗口事件
oEvent = window.event ? window.event : event;

//计算提示框位置
var iLeft = oEvent.clientX - dragData["x"] + parseInt(oObj.style.left);
var iTop = oEvent.clientY - dragData["y"] + parseInt(oObj.style.top);

//设置提示框位置
oObj.style.left = iLeft + "px";
oObj.style.top = iTop + "px";

//设置IE屏蔽层位置
$('dialogBoxHideIFrame').style.left = iLeft + "px";
$('dialogBoxHideIFrame').style.top = iTop + "px";

//设置阴影位置
$('dialogBoxShadow').style.left = iLeft + ShadowWdith + "px";
$('dialogBoxShadow').style.top = iTop + ShadowHeight + "px";

//刷新保留鼠标位置
dragData = {x: oEvent.clientX, y: oEvent.clientY};
}

//鼠标键抬起
function mouseup(event){
//获取窗口事件
oEvent = window.event ? window.event : event;

//清除对象拖动操作
oObj.onmousemove = null;
oObj.onmouseup = null;

//如果鼠标是否超出浏览器范围
if(oEvent.clientX < 1 || oEvent.clientY < 1 || oEvent.clientX > document.body.clientWidth || oEvent.clientY > document.body.clientHeight){
//还原提示框位置
oObj.style.left = backData.y + "px";
oObj.style.top = backData.x + "px";

//还原IE屏蔽层位置
$('dialogBoxHideIFrame').style.left = backData.y + "px";
$('dialogBoxHideIFrame').style.top = backData.x + "px";

//还原阴影位置
$('dialogBoxShadow').style.left = backData.y + ShadowWdith + "px";
$('dialogBoxShadow').style.top = backData.x + ShadowHeight + "px";
}

//关闭捕获鼠标移动
oObj.releaseCapture ? oObj.releaseCapture() : function(){};
}
}

//显示背景遮罩层
//参数一()： 设置最小透明度，空则使用默认(0-100)
//参数二()： 设置最大透明度，空则使用默认(0-100)
//参数三()： 设置逐步增加数值(0-100)
//参数四()： 设置运行速度(1000=1秒)
this.showSO = function(){
//获取背景遮罩层属性
var objScreen = $("ScreenOver");

//如果背景遮罩层不存在则创建
if(!objScreen) var objScreen = document.createElement("div");

//设置背景遮罩层ID
objScreen.id = "ScreenOver";

//获取背景遮罩层样式
var oS = objScreen.style;

//隐藏页面滚动条
document.body.style.overflow="hidden";

//获取屏幕宽度，高度
if (document.body.clientHeight) {
var ww = document.body.clientWidth + "px";
var wh = document.body.clientHeight + "px";
}else if (window.innerHeight){
var ww = window.innerWidth + "px";
var wh = window.innerHeight + "px";
}else{
var ww = "100%";
var wh = "100%";
}

//设置背景遮罩曾
oS.display = "block";
oS.top = oS.left = oS.margin = oS.padding = "0px";
oS.width = ww;
oS.height = wh;
oS.position = "absolute";
oS.zIndex = "98";
oS.top=document.body.scrollTop + "px";
oS.background = ScreenOverBgColor;
oS.filter = "alpha(opacity=0)";
oS.opacity = 0;
oS.MozOpacity = 0;

//加入页面
document.body.appendChild(objScreen);

//获取所有select控件
var allselect = document.getElementsByTagName("select");
var i=0;

//设置所有select控件无效，变暗
for (i=0; i<allselect.length; i++){
allselect[i].disabled = true;
allselect[i].style.background="#aaa";
}

//获取隐藏参数，最小透明度(0-100)、最大透明度(0-100)、增加减少数(0-100),运行速度(1000=1秒)
var opacity_min = arguments[0]?arguments[0]:ScreenOverOpacityMin;
var opacity_max = arguments[1]?arguments[1]:ScreenOverOpacityMax;
var opacity_speed = arguments[2]?arguments[2]:ScreenOverOpacitySpeed;
var opacity_sleep = arguments[3]?arguments[3]:ScreenOverOpacitySleep;
var opacity = parseInt(opacity_min);

//显示背景遮罩层
function showscreenover(){
//设置背景遮罩层透明度
$('ScreenOver').style.filter="alpha(opacity="+opacity+")";
$('ScreenOver').style.opacity=opacity/100;
$('ScreenOver').style.MozOpacity=opacity/100;

//如果没有到最大透明度
if(opacity<parseInt(opacity_max)){
//减低透明，间隔后再运行
opacity=opacity+parseInt(opacity_speed);
setTimeout(showscreenover,parseInt(opacity_sleep));
}
}
showscreenover();
}

//隐藏背景遮罩层
//参数一()： 设置最小透明度，空则使用默认(0-100)
//参数二()： 设置最大透明度，空则使用默认(0-100)
//参数三()： 设置逐步增加数值(0-100)
//参数四()： 设置运行速度(1000=1秒)
this.hideSO = function(){
//获取隐藏参数，最小透明度(0-100)、最大透明度(0-100)、增加减少数(0-100),运行速度(1000=1秒)
var opacity_min = arguments[0]?arguments[0]:ScreenOverOpacityMin;
var opacity_max = arguments[1]?arguments[1]:ScreenOverOpacityMax;
var opacity_speed = arguments[2]?arguments[2]:ScreenOverOpacitySpeed;
var opacity_sleep = arguments[3]?arguments[3]:ScreenOverOpacitySleep;
var opacity = parseInt(opacity_max);

//获取背景遮罩层属性
var objScreen=$("ScreenOver");

//如果背景遮罩层不存在则建立
if(!objScreen) var objScreen = document.createElement("div");

//设置背景遮罩层ID
objScreen.id = "ScreenOver";

//加入页面
document.body.appendChild(objScreen);

//隐藏背景遮罩层
function hiddenscreenover(){
//设置背景遮罩层透明度
$('ScreenOver').style.filter="alpha(opacity="+opacity+")";
$('ScreenOver').style.opacity=opacity/100;
$('ScreenOver').style.MozOpacity=opacity/100;

//如果未达到最小透明度
if(opacity>parseInt(opacity_min)){
//加大透明，间隔后再运行
opacity=opacity-parseInt(opacity_speed);
setTimeout(hiddenscreenover,parseInt(opacity_sleep));
}else{
//如果达到最小透明度
//移除背景遮罩层
document.body.removeChild(objScreen);

//恢复页面滚动条状态
document.body.style.overflow=bodyoverflow;

//获取所有select控件
var allselect = document.getElementsByTagName("select");
for (var i=0; i<allselect.length; i++){
//设置所有select控件有效,还原颜色
allselect[i].disabled = false;
allselect[i].style.background="#fff";
}
}
}
hiddenscreenover();
}

//设置提示框属性
this.middle = function(_sId){
//设置提示框属性，并调整位置，居中
$(_sId)['style']['display'] = '';
$(_sId)['style']['position'] = "absolute";
$(_sId)['style']['left'] = (document.body.clientWidth / 2) - ($(_sId).offsetWidth / 2) + "px";
$(_sId)['style']['top'] = (document.body.clientHeight / 2 + document.body.scrollTop) - ($(_sId).offsetHeight / 2) + "px";
}
}