Run JavaScript Only After Entire Page Has Loaded

$(window).bind("load", function() {
   // code here
});

use this :
http://css-tricks.com/snippets/jquery/run-javascript-only-after-entire-page-has-loaded/

ex:

  $(window).bind("load", function() {

            debugger;
            var divs = $("div.CollapsiblePanelClosed")
            var spans = $("span.spanclass")
            for (var i = 0; i < divs.length; i++) {
                if (spans[i].innerHTML == "") {
                    document.getElementById(divs[i].id).style.display = "none";
                }
            }


        });