asp.net 按钮执行添加遮盖层

var coverLayer = {
divObj : null,
_coverTime : null,

// _coverRe : function()
// {//刷新遮盖层
//   this.divObj.style.width = window.screen.availWidth + "px";
//   this.divObj.style.height = window.screen.availHeight + "px";
// },

on : function(noSave)
{ //打开遮盖层
if(this.divObj == null)
{
this.divObj = document.createElement("div");
this.divObj.style.zIndex = 10000;
this.divObj.id='divObj';
this.divObj.style.position = "absolute";
this.divObj.style.left = '0px';
this.divObj.style.top = '0px';
this.divObj.style.right = '-20px';
this.divObj.style.backgroundColor = "#DDDDDD";
this.divObj.style.fontSize = "x-large";
this.divObj.style.textAlign ="center";

this.divObj.innerText="处理中...";

var tempFrame = document.createElement("iframe");
tempFrame.style.filter = "Alpha(Opacity=0)";
tempFrame.frameBorder=0;
tempFrame.scrolling="no";
tempFrame.style.width = "100%";
tempFrame.style.height = "100%";
//   tempFrame.style.position = "absolute";
//   tempFrame.style.zIndex = -1;
//   tempFrame.style.visibility="inherit";
//   tempFrame.style.left = '0px';
//   tempFrame.style.top = '0px';

this.divObj.appendChild(tempFrame);
this.divObj.style.filter = "Alpha(Opacity=80)";

document.body.appendChild(this.divObj);
};
this.divObj.style.width =  document.documentElement.clientWidth + "px";
this.divObj.style.height =  document.documentElement.clientHeight + "px";
this.divObj.style.paddingTop =document.documentElement.clientHeight / 2 + "px";

this.divObj.style.display = "block";
// clearInterval(this._coverTime);
//this._coverTime = setInterval("coverLayer._coverRe()",1);
},

off : function(noSave)
{ //关闭遮盖层
if(this.divObj){this.divObj.style.display = "none"};
//clearInterval(this._coverTime);
}
}

''' <summary>
''' 通用事件添加
''' </summary>
''' <param name="oControl">控件容器</param>
''' <remarks></remarks>
Public Shared Sub LoopingControlsShowDiv(ByVal oControl As Control)
Dim frmCtrl As Control
For Each frmCtrl In oControl.Controls
'If TypeOf frmCtrl Is TextBox Then
'End If
'If TypeOf frmCtrl Is DropDownList Then
'End If
'If TypeOf frmCtrl Is CheckBox Then
'End If
'If TypeOf frmCtrl Is RadioButton Then
'End If
'If TypeOf frmCtrl Is FileUpload Then
'End If
If TypeOf frmCtrl Is Button Then
'显示“处理中……”div
CType(frmCtrl, Button).OnClientClick = "coverLayer.on();"
End If
If TypeOf frmCtrl Is LinkButton Then
'显示“处理中……”div
CType(frmCtrl, LinkButton).OnClientClick = "coverLayer.on();"
End If
If frmCtrl.HasControls Then
LoopingControlsShowDiv(frmCtrl)
End If
Next
End Sub

'是否删除？
btnDelete.Attributes.Add("onclick", "javascript:if(!confirm('是否删除？')){coverLayer.off();return false;}else{return true;};")