addDOMLoadEvent = (function(){ 
    // create event function stack 
    var load_events = [], 
        load_timer, 
        script, 
        done, 
        exec, 
        old_onload, 
        init = function () { 
            done = true; 

            // kill the timer 
            clearInterval(load_timer); 

            // execute each function in the stack in the order they were added 
            while (exec = load_events.shift()) 
                exec(); 

            if (script) script.onreadystatechange = ''; 
        }; 

    return function (func) { 
        // if the init function was already ran, just run this function now and stop 
        if (done) return func(); 

        if (!load_events[0]) { 
            // for Mozilla/Opera9 
            if (document.addEventListener) 
                document.addEventListener("DOMContentLoaded", init, false); 

            // for Internet Explorer 
            /*@cc_on @*/ 
            /*@if (@_win32) 
                document.write("<script id=__ie_onload defer src=//0><\/scr"+"ipt>"); 
                script = document.getElementById("__ie_onload"); 
                script.onreadystatechange = function() { 
                    if (this.readyState == "complete") 
                        init(); // call the onload handler 
                }; 
            /*@end @*/ 

            // for Safari 
            if (/WebKit/i.test(navigator.userAgent)) { // sniff 
                load_timer = setInterval(function() { 
                    if (/loaded|complete/.test(document.readyState)) 
                        init(); // call the onload handler 
                }, 10); 
            } 

            // for other browsers set the window.onload, but also execute the old window.onload 
            old_onload = window.onload; 
            window.onload = function() { 
                init(); 
                if (old_onload) old_onload(); 
            }; 
        } 

        load_events.push(func); 
    } 
})();