/* JAVASCRIPT FILE */

function getXMLHTTPRequest()
{
 var req;
 try{
  req = new XMLHttpRequest();  /*  e.g. Firefox  */  
 }
 catch(err){
  try{
   req = new ActiveXObject("Msxml2.XMLHTTP"); /* Some Versions of IE */
  }
  catch(err){
   try{
    req = new ActiveXObject("Microsoft.XMLHTTP"); /* Some Versions of IE*/
   }
   catch(err){
    req = false;
   }
  }
 }
 return req;
}

var myRequest = getXMLHTTPRequest();

function callAjax(x, y){   
 var url = "get_pic.php?compcode=" + x + "&prefcode=" + y;
 var myRandom = parseInt(Math.random()*99999999);
 myRequest.open("GET", url + "&rand=" + myRandom, true);
 myRequest.onreadystatechange = responseAjax;
 myRequest.send(null);
}

function responseAjax(){
 if(myRequest.readyState == 4){
  document.getElementById('select_change').innerHTML = myRequest.responseText;
 }
 if(myRequest.readyState <= 3){
  document.getElementById('select_change').innerHTML = '<img style="position: relative; top: 130px; left: 210px;" src="img/ajax-loader.gif" />';
 }
}