要完成此效果把如下代码加入到<body>区域中
<form name="rolloverbox" class="ppkoabcd">
<p align="center">
<input type="checkbox" name="boxes" value="ON">
<a href="link.htm" onMouseover="rollovercheck(0)" onMouseout="rolloutcheck(0)">链接一</a><br>
<input type="checkbox" name="boxes" value="ON">
<a href="link.htm" onMouseover="rollovercheck(0)" onMouseout="rolloutcheck(1)">链接二</a><br><input type="checkbox" name="boxes" value="ON">
<a href="link.htm" onMouseover="rollovercheck(0)" onMouseout="rolloutcheck(2)">链接三</a><br><input type="checkbox" name="boxes" value="ON">
<a href="link.htm" onMouseover="rollovercheck(0)" onMouseout="rolloutcheck(3)">链接四</a><br>
</form>
<script language="JavaScript">
<!--
var thebox=document.rolloverbox
function rollovercheck(whichbox){
thebox.boxes[whichbox].checked=true
}
function rolloutcheck(whichbox){
thebox.boxes[whichbox].checked=false
}
//-->
</script>
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