var aWindowOnload = Array();
    
    function window_onload_register(function_name) {
        aWindowOnload[aWindowOnload.length] = function_name;
    }
    
    function window_onload() {
        for (var i = 0; i < aWindowOnload.length; i++) {
            aWindowOnload[i]();
        }
    }
    
    window.onload=window_onload;