function setImgRoot(root){
				window.img_root = "../" + root;
			}
			
			function preloadImages(imgs)
			{
			  for(var i = 0; i<imgs.length; i++)
			  {
			    $("<img>").attr("src", img_root + imgs[i]);
			    //alert(img_root + imgs[i]);
			  }
			}
			
			function menuItem(id, show){
				
				var arr = [1, 2, 3, 4, 5];
				
				//run the effect
				if(show == '1'){
					showMenuItem(id);
				}else{
					window.setTimeout("hideMenuItem("+id+")", 300);
					//hideMenuItem(id);
				}
			}
			
			function showMenuItem(id){
				if($("#menu_title" + id).is(":hidden")){
					$("#menu_title" + id).show("slide",{direction: "right"},500);
					$("#menu").css({'z-index': '100'});
					$("#menu_icon" + id).css({'background-image': 'url('+ img_root + 'images/menu_titlebg.png)', 'background-repeat': 'repeat-x'});
				}
			}
			
			function hideMenuItem(id){				
				if($("#menu_title" + id).is(":visible")){
					$("#menu_title" + id).hide("slide",{direction: "right"},500, hideMenuBg(id));
					$("#menu").css({'z-index': '30'});
				}
			}
			
			function hideMenuBg(id){
				$("#menu_icon" + id).css({'background-image': 'url('+ img_root + 'images/menu_iconbg.png)'});
			}
			
			function slideMenu(){
				$("#menu").show("slide", {direction: "up"}, 500);
				window.setTimeout("chgMenuBg()", 500);
			}
			
			function chgMenuBg(){
				$('#menu_bgimg').attr('src', img_root + 'images/02b.gif');
			}