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();
});
 
if (document.images) {
     button1 = new Image
     button2 = new Image
	 button3 = new Image
     button4 = new Image

     button1.src = '../images/uk-big.png'
     button2.src = '../images/uk-small.png'
	 button3.src = '../images/usa-big.png'
     button4.src = '../images/usa-small.png'
 }