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

addOnDomReady = 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();
    }
}