function menu_dropdown(){
$(" #main_navigation ul ").css({display: "none"}); // Opera Fix
$(" #main_navigation li").hover(function(){
		$(this).addClass('active_hover');
		$(this).find('ul:first:hidden').css({visibility: "visible",display: "none"}).fadeIn("fast");

		},function(){
		$(this).removeClass('active_hover');
		$(this).find('ul:first').css({visibility: "hidden", display: "none"});
		});
}

$(document).ready(function(){
	/* Add .pdf icon to links */
    $("a[href$='.pdf']", "#right_column").addClass('pdf');
	
	/* Initialize Dropdown Menu */
	menu_dropdown();

});