startStack=function() { };  // A stack of functions to run onload/domready

registerOnLoad = function(func) {
   var orgOnLoad = startStack;
   startStack = function () {
      orgOnLoad();
      func();
      return;
   }
}

var ranOnload=false; // Flag to determine if we've ran the starting stack already.

if (document.addEventListener) {
  // Mozilla actually has a DOM READY event.
   document.addEventListener("DOMContentLoaded", function(){if (!ranOnload) {ranOnload=true; startStack();}}, false);
}  else if (document.all && !window.opera) {
  // This is the IE style which exploits a property of the (standards defined) defer attribute
  document.write("<scr" + "ipt id='DOMReady' defer=true " + "src=//:><\/scr" + "ipt>");  
  document.getElementById("DOMReady").onreadystatechange=function(){
    if (this.readyState=="complete"&&(!ranOnload)){
      ranOnload=true;
      startStack();
    }
  }
}

var orgOnLoad=window.onload;
window.onload=function() {
   if (typeof(orgOnLoad)=='function') {
      orgOnLoad();
   }
   if (!ranOnload) {
     ranOnload=true;
     startStack();
   }
}