function mainmenu(){
$(" #nav ul ").css({display: "none"}); // Opera Fix
$(" #nav li").hover(function(){
		$(this).find('ul:first').css({visibility: "visible",display: "none"}).show(400);
		},function(){
		$(this).find('ul:first').css({visibility: "hidden"});
		});
}



$(document).ready(function() {
    mainmenu();
    $(".side_image").css('height', $("#center_page").height());
});

$(document).load(function() {
    $(".side_image").css('height', $("#center_page").height());
});