var http = getHTTPObject();

function checkUserName(str)
{   
	
	var url = "ajaxuser.php?&uname="+str; // The server-side script		

    http.open("GET", url, true);
	http.onreadystatechange = handleHttpResponse2;
	http.send(null);
}
		
function handleHttpResponse2() {	
		if (http.readyState == 4) {
			  if(http.status==200) { 
			  	var results=http.responseText;
				if(results.length != 0){
				   //alert(result);
					document.getElementById('errorUsrName').style.display = 'block';
			   		document.getElementById('errorUsrName').innerHTML = results;
				}
				else{
					document.getElementById('errorUsrName').style.display = 'none';
				}
			  }
  			}
		}
		
	    	
function getHTTPObject() {
  var xmlhttp;
 
  if(window.XMLHttpRequest){
    xmlhttp = new XMLHttpRequest();
  }
  else if (window.ActiveXObject){
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
    if (!xmlhttp){
        xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
    
}
  return xmlhttp;

  
}