// JavaScript Document

function OnChangedUsername()

{

if(document.frm.username.value == "")

{

document.frm.btnCheckAvailability.disabled = true;

}

else

{

document.frm.btnCheckAvailability.disabled = false;

}

}



function OnCheckAvailability()

{

     if(document.frm.username.value=="")

     {

        alert("username cannot be blank");

		document.frm.username.focus();

	    return;	  

     }	

    

	if (isNaN(document.frm.username.value)== false)

	{

	alert("Invalid username"); 

	document.frm.username.focus();

	document.frm.username.select();

	return false;

	}	

if(window.XMLHttpRequest)

{

oRequest = new XMLHttpRequest();

}

else if(window.ActiveXObject)

{

oRequest = new ActiveXObject("Microsoft.XMLHTTP");

}



oRequest.open("POST", "Ajax.asp", true);

oRequest.onreadystatechange = UpdateCheckAvailability;



oRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

oRequest.send("strCmd=availability&strUsername=" + document.frm.username.value);

}



function UpdateCheckAvailability()

{

if(oRequest.readyState == 4)

{ 

if(oRequest.status == 200)

{

	document.getElementById("Available").innerHTML = oRequest.responseText;

 

}

else

{

document.getElementById("Available").innerHTML = "Asychronous Error";

}

}

}



/*function UpdateCheckAvailability()

{

document.getElementById("Available").innerHTML = oRequest.responseText;

}*/