Hi,
Here I write some code to restrict selection
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src="Scripts/jquery-1.4.1-vsdoc.js" type="text/javascript"></script>
<script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
<script language ="javascript" >
var tim = 500;
var tmp;
function f1(tagid) {
if (parseInt(tim) == 0) {
document.getElementById(tagid).checked = false;
}
}
function strt() {
if (parseInt(tim) > 0) {
tim = parseInt(tim) - 1;
tmp = setInterval("strt()", 100);
}
else {
tim = 0;
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type ="button" value ="start" id="btnstart" onclick="strt()" />
<input type="checkbox" id="check1" value="option1" onclick="f1(this.id)" />
<input type="checkbox" id="Checkbox2" value="option2" onclick="f1(this.id)" />
<input type="checkbox" id="Checkbox3" value="option3" onclick="f1(this.id)" />
<input type="checkbox" id="Checkbox4" value="option4" onclick="f1(this.id)" />
</div>
</form>
</body>
</html>
try this it can helps you
All the Best