var xmlHttp

function exist_user(lang){

	var user = document.getElementById('messagesTo').value; 

	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null)
	{
		alert ("Browser does not support HTTP Request")
		return
	}

	var url="existuser.php"
	url=url+"?user="+user
	url=url+"&lang="+lang
	url=url+"&sid="+Math.random()	
	xmlHttp.onreadystatechange=stateCheckMsg
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)			
}
function stateCheckMsg()
{
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	 {
		result=xmlHttp.responseText
		if(result == "0"){
			document.sendmsg.submit();
		}
		else{ 		
			document.getElementById("errmsg").innerHTML=result; 
			alert(result)
		}	
	 }
}