var xmlHttp

function CheckLogin(str1,str2)
{
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
{
alert ("Browser does not support HTTP Request")
return
}

var url = "checkuser.php";
var params = "user="+str1+"&pwd="+str2+"";
xmlHttp.onreadystatechange=stateChanged2
xmlHttp.open("POST", url, true);

//Send the proper header information along with the request
xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded", true);
xmlHttp.setRequestHeader("Content-Length", params.length);
xmlHttp.setRequestHeader("Connection", "close");

xmlHttp.send(params);
//return false;
}


function stateChanged2() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{
   document.getElementById("txtHint").innerHTML=xmlHttp.responseText;
   //alert(xmlHttp.responseText);
}
}

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