Javascript Progess bar collection

function onSubmit(upload_id)
{
var xmlhttp;
var test;
test =1;
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.open("GET",'/fileupload/progressbar.php?progress_key='+upload_id, false);
xmlhttp.send();
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    if(test=1)
        {
            document.getElementById('progress_number').innerHTML=xmlhttp.getResponseHeader("Percent");
            setTimeout(onSubmit(upload_id), 999);
        }
    else
        {
            document.getElementById('progress_number').innerHTML="Percent more then 100";
        }
    }
    else
    {
        document.getElementById('progress_number').innerHTML="Error: Status Code Not 200";
    }
  }
}