javascript checkbox 赋值选中

<%@ page language="java"  isELIgnored="false" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>
<%@ page import="com.wprss.util.*" %>
<mce:style type="text/css"><!--
body {
margin-left: 3px;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
}
body,td,th {
font-size: 13px;
}
--></mce:style><style type="text/css" mce_bogus="1">body {
margin-left: 3px;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
}
body,td,th {
font-size: 13px;
}</style>
<mce:script type="text/javascript"><!--
function getValue()
{
var ChkboxValue = "";
var chks = document.getElementsByTagName("input");
for(var i=0; i<chks.length; i++)
{
if(chks[i].type=="checkbox" && chks[i].checked )
{
if ( ChkboxValue == "" )
ChkboxValue = chks[i].value;
else
ChkboxValue += ","+chks[i].value;
}
}
document.getElementById("hi").value=ChkboxValue;
//alert(ChkboxValue);
}
// --></mce:script>

<logic:present name="listFDC">
<logic:iterate id="it" name="listFDC" indexId="index">
<input type="checkbox" id="fdcdispaly" name="fdcdispaly" value="${it.wppid}" onclick="getValue();"/>${it.wppname}<br>
</logic:iterate>
</logic:present>

<mce:script type="text/javascript"><!--
var temp="${sessionScope.fdcdisplay}";

if(temp!="")
{

if(temp.indexOf(",")!=-1)
{
var strtext= new Array();
strtext=temp.split(",");
//alert(document.all("fdcdispaly").length);
for(var i=0;i<strtext.length;i++)
{
for(var j=0;j<document.all("fdcdispaly").length;j++)
{
if(document.all("fdcdispaly")[j].value==strtext[i])
{
document.all("fdcdispaly")[j].checked=true;
break;
}
}
}
}
else
{
for(var j=0;j< document.all("fdcdispaly").length;j++)
{
if(document.all("fdcdispaly")[j].text==temp)
{
document.all("fdcdispaly")[j].checked=true;
break;
}
}

}

//反选
for(var i=0;i<document.all("fdcdispaly").length;i++)
{
f =document.all("fdcdispaly")[i];
if(f.checked==false)
{
f.checked=true;
}
else
{
f.checked=false;
}
}

}
// --></mce:script>
<input id="hi" name="hi" type="hidden" value="" />