var xmlHttp;

function showHint(str)
{
if (str.length==0)
{ 
document.getElementById("txtHint").innerHTML="";
document.getElementById("txtHint").style.display="none";
return;
}
document.getElementById("txtHint").style.display="block";
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
{
alert ("Browser does not support HTTP Request");
return;
} 
var url="../library/gethint.php?q="+str+"&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("txtHint").innerHTML=xmlHttp.responseText;
 } 
}

function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}