function getAjaxobject(obj) {
  if (document.getElementById)
    return document.getElementById(obj)
  else if (document.all)
    return document.all[obj]
}

function ajaxFunction() {

  var AjaxScript = "http://vl.techonline.com/DisplayVirtuaLab/TechOnline.aspx?ts=" + new Date();
  try {
    getAjaxobject('display_lab').innerHTML ="<iframe id='RSIFrame' src='"+ AjaxScript  +"' scrolling=no frameborder=0 width=100% height=195><\/iframe>";
  } catch (e){
    return false;
  }
}

window.onload=ajaxFunction;