function Inint_AJAX() {
   try { return new ActiveXObject("Msxml2.XMLHTTP");  } catch(e) {}
   try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {}
   try { return new XMLHttpRequest();          } catch(e) {}
   alert("XMLHttpRequest not supported");
   return null;
};

function searchchange(src, job_cat) {
     var req = Inint_AJAX();
     req.onreadystatechange = function () { 
          if (req.readyState==4) {
               if (req.status==200) {
                    document.getElementById(src).innerHTML=req.responseText;
               } 
          }
     };
     req.open("GET", "infusions/job/ajax/search.php?"+CatView+"ident="+src+"&job_cat="+job_cat);
     req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset="+CatChapset);
     req.send(null); //send value
}

window.onLoad=searchchange('job_cat', -1);