function generateusername(tblno)
{
var xmlRequest;
url="generateusername.php"
val=document.getElementById("username").value
if(val=="")
	{
	alert("username cannot be empty");
	}
else
	{
	var pageUrl = url+"?val="+val+"&tblval="+tblno
	pageUrl=pageUrl+"&nocache=" + Math.random();
	//alert(pageUrl)
			if(window.ActiveXObject)
			 {
				 xmlRequest = new ActiveXObject("Microsoft.XMLHTTP");
			 }
			 else
			 {
				 xmlRequest = new XMLHttpRequest();
			 }
			xmlRequest.open("GET", pageUrl, true);
			xmlRequest.send(null);
		xmlRequest.onreadystatechange=function()
		{
			if(xmlRequest.readyState==4)
				//alert(xmlRequest.responseText)
			newname=xmlRequest.responseText;
			document.getElementById("usernamelist").innerHTML="<br>"+newname
			document.getElementById("usernamelist").style.display="block"
		}

	}
}