function primary_navigation_dropdown(){

$("#primary_nav li ul").css({display: "none"}); // Opera Fix

$("#primary_nav li").hover(function()
	{
		// adds hover class to li to maintain hover status when in sub-menu
		$(this).addClass('hover');
		
		// .fadeIn Animation can be modified to client needs
		$(this).find('ul:first').stop(true,true).css({visibility: "visible"}).slideDown(0);
		
		// switch
	},function(){
		
		// hides li ul list
		$(this).find('ul:first').stop(true,true).slideUp(0);
		
		// removes li hover class
		$(this).removeClass('hover');

	});
}
 
// Execute when document is ready
$(document).ready(function(){primary_navigation_dropdown();});