// This function sets up the AJAX call to the server
function ajaxPost(responseType,sURL)
{
    var xmlhttp;
    if (window.XMLHttpRequest)
      {
      // code for IE7+, Firefox, Chrome, Opera, Safari
      xmlhttp=new XMLHttpRequest();
      }
    else
      {
      // code for IE6, IE5
      xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    xmlhttp.onreadystatechange=function()
    {
    if(xmlhttp.readyState==4)
      {
      // When the server responds, run a local JavaScript
      // function to process the results
      ajaxResponse(responseType, xmlhttp.responseText);
      }
    }
    xmlhttp.open("GET",sURL,true);
    xmlhttp.send(null);
}