https://alcaldiaeltorno.com/templates/zt_news_iii/zt_menus/zt_fancymenu/zt_fancymenu.js

1/**
2	Fancy menu class
3	Jan 14, 2011
4*/
5var ZTFancy = new Class({
6	initialize: function(menu, options){
7		this.setOptions(this.getOptions(), options);
8		this.menu = $(menu), this.current = $(document.body).getElement('li[class$=active]');
9		this.menu.getElements('li').each(function(item){
10			if(item.getProperty('class').split(' ')[0] != 'mega-li')
11			{
12				item.addEvent('mouseover', function(){this.moveBg(item);}.bind(this));
13				item.addEvent('mouseout', function(){this.moveBg(this.current);}.bind(this));
14			}
15		}.bind(this));
16		this.back = new Element('li').addClass('fancy').adopt(new Element('div').addClass('fancy-left').adopt(new Element('div').addClass('fancy-right'))).injectInside(this.menu);
17		this.back.fx = this.back.effects(this.options);
18		if(this.current) this.setCurrent(this.current);
19	},
20
21	setCurrent: function(el, effect){
22		
23		xPos 	= el.offsetLeft;
24		wPos	= el.offsetWidth;
25		tempEl 	= el.offsetParent;
26		
27		while(tempEl != null) {
28			xPos 	+= tempEl.offsetLeft;
29			tempEl 	 = tempEl.offsetParent;
30		}
31		
32		this.back.setStyles({left: (xPos)+'px', width: (wPos)+'px'});
33		(effect) ? this.back.effect('opacity').set(0).start(1) : this.back.setOpacity(1);
34		
35		this.current = el;
36	},
37
38	getOptions: function(){
39		return {
40			transition: Fx.Transitions.linear,
41			duration: 500, wait: false,
42			onClick: Class.empty
43		};
44	},
45
46	clickItem: function(event, item) {
47		if(!this.current) this.setCurrent(item, true);
48		this.current = item;
49		this.options.onClick(new Event(event), item);
50	},
51
52	moveBg: function(to) {
53		if(!this.current) return;
54		
55		xPos 	= to.offsetLeft;
56		wPos	= to.offsetWidth;
57		tempEl 	= to.offsetParent;
58		
59		while(tempEl != null) {
60			xPos 	+= tempEl.offsetLeft;
61			tempEl 	 = tempEl.offsetParent;
62		}
63		
64		this.back.fx.custom({
65			left: [this.back.offsetLeft, xPos],
66			width: [wPos, wPos]
67		});
68	}
69});
70ZTFancy.implement(new Options);