function ajax_retrieve(str) {
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null) {
  		alert ("Your browser does not support AJAX!");
  		return;
  	}
	var url="ajaxcall.php";
	url=url+"?image="+str;
	url=url+"&sid="+Math.random();
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function GetXmlHttpObject() {
  var xmlHttp=null;
  try {
	  // Firefox, Opera 8.0+, Safari
	  xmlHttp=new XMLHttpRequest();
  }
  catch (e) {
	  // Internet Explorer
	  try {
		  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
	  }
	  catch (e) {
		  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
  }
  return xmlHttp;
}

function stateChanged() {
	if (xmlHttp.readyState==4) {
		document.getElementById("txtHint").innerHTML=xmlHttp.responseText;
	}
}