url = document.location.href;
xend = url.lastIndexOf("/") + 1;
var base_url = url.substring(0, xend);

function ajax_do (url) {
           if (url.substring(0, 4) != 'http') {
                url = base_url + url;
        		}
               var jsel = document.createElement('SCRIPT');
        jsel.type = 'text/javascript';
        jsel.src = url;
        document.body.appendChild (jsel);
}
function ajax_check (url) {
           if (url.substring(0, 4) != 'http') {
                url = base_url + url;
        		}
			xmlHttp=GetXmlHttpObject()		
			xmlHttp.onreadystatechange=ajax_getvalue; 
			xmlHttp.open("GET",url,true);
			xmlHttp.send(null);
}
function ajax_getvalue()
{
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
		result=xmlHttp.responseText;
		document.getElementById("emailcheck").value=result;		
		if(result==1)
		{
			document.getElementById("usernamecheck").style.display="block";
			obj.focus();
		}
	} 
}
function GetXmlHttpObject()
{ 
	var objXMLHttp=null;
	if (window.XMLHttpRequest)
	{
		objXMLHttp=new XMLHttpRequest()
	}
	else if (window.ActiveXObject)
	{
		objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
return objXMLHttp;
}