Thread: a jquery question please hellllllllllllpppp !!!!

// grab the initial top offset of the navigation 
var sticky_navigation_offset_top = jQuery('.header_menu').offset().top;
		 
// our function that decides weather the navigation bar should have "fixed" css position or not.
var sticky_navigation = function(){
        // our current vertical position from the top	
        var scroll_top = jQuery(window).scrollTop(); 
       
	// if we've scrolled more than the navigation
	if (scroll_top > sticky_navigation_offset_top) { 
		// your box 200x200 here
                // write your jquery code to show whatever you want
	}
};
		 
// run our function on load
sticky_navigation();
		 
// and run it again every time you scroll
jQuery(window).scroll(function() {
       sticky_navigation();
});

http://www.design3edge.com/2012/11/16/5-best-open-source-ecommerce-cms/