I am using jQuery's thickbox.js pluging, for a modal dialog box that will appear when some one first loads the website(as a welcome banner), and after clicking on "enter site" they should be logged in to my home page. But the problem is "Modal dialog box appear's to be empty in some system(i.e OS), with same configuration, and shows only the loading progress bar". it works in some system only.. please help to find the problem??