$(document).ready(function() {  
	$(".main_nav_fade_in").hide();
	$("li a").hover(function(){
		var $root = $(this);
		$root.children(".main_nav_fade_out").hide();
			$root.children(".main_nav_fade_in").show();
	},function(){
		var $root = $(this);
	    $root.children(".main_nav_fade_in").hide();
		$root.children(".main_nav_fade_out").show();
  	});
});

function popUp(URL, name) {
$top_pos = (screen.availHeight/2)-280;
$wide_pos = (screen.availWidth/2)-300;

window.open(URL, name, 'toolbar=0, scrollbars=1, location=0, statusbar=0, menubar=0, resizable=0, width=560, height=600, left='+$wide_pos+', top='+$top_pos+'');
}

function popUp_extern(URL, name, width, height) {
$top_pos = (screen.availHeight/2)-(height/2);
$wide_pos = (screen.availWidth/2)-(width/2);

popupWindow = window.open(URL, 'name', 'toolbar=0, scrollbars=1, location=0, statusbar=0, menubar=0, resizable=0, width='+width+', height='+height+', left='+$wide_pos+', top='+$top_pos+'');

}