var xmlHttp;

function showHint(str)
{
	if (str.length==0)
	{
		document.getElementById("usernamecheck").innerHTML=""
		return
	}
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
	{
		alert ("Browser does not support HTTP Request")
		return
	}
	var url="gethint.php"
	url=url+"?q="+str
	url=url+"&sid="+Math.random()
	xmlHttp.onreadystatechange=stateChanged
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
}

function stateChanged()
{
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{
		document.getElementById("usernamecheck").innerHTML=xmlHttp.responseText
	}
}

function GetXmlHttpObject()
{
	var objXMLHttp=null
	if (window.XMLHttpRequest){
		objXMLHttp=new XMLHttpRequest()
	}
	else if (window.ActiveXObject){
		objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")
	}
	return objXMLHttp
}