window.addEvent('domready', function() {
  
	changeurl = function() {
		var src = this.get('src');
		var length = src.length;
		var current = src.substr(length - 5,1).toInt();
		var next = (current > 7) ? 1 : current + 1;
		this.set('src',src.replace('-' + current + '.jpg','-' + next + '.jpg'))
	}

	var middle = document.id('middle');
	var thumbs;
	var timer;
	
	if (middle) {
		thumbs = middle.getElements('img.thumb');
		
		if (thumbs) {
			
			thumbs.each(function(thumb) {
				if (thumb) {
					thumb.addEvents({
						'mouseover' : function() {
							timer = changeurl.periodical(500,this);
						},
						'mouseout' : function() {
							clearInterval(timer);
						}
					}); 
				}
			});
		}
	}
	
});