Hi Abhijit,
"join" concatenates the array elements with a specified seperator between them.
Here is an example :
<script type="text/javascript">
var days = ["Sunday","Monday","Tuesday","Wednesday", "Thursday","Friday","Saturday"];
document.write("days:"+days.join(","));
</script>
This produces
days:Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday
Nov 23, 2009