var timer = null;
var offset = 5000;
var index = 0;

// ´óͼ½»ÌæÂÖ»»
function slideImage(i) {
	var id = 'image_' + target[i];
	$('#' + id).animate({
				opacity : 1
			}, 800, function() {
				$(this).find('.word').animate({
							height : 'show'
						}, 'slow');
			}).show().siblings(':visible').find('.word').animate({
				height : 'hide'
			}, 'fast', function() {
				$(this).parent().animate({
							opacity : 0
						}, 800).hide();
			});
}
// bind thumb a
function hookThumb() {
	$('#thumbs li a').bind('click', function() {
				if (timer) {
					clearTimeout(timer);
				}
				var id = this.id;
				index = getIndex(id.substr(6));
				rechange(index);
				slideImage(index);
				timer = window.setTimeout(auto, offset);
				this.blur();
				return false;
			});
}
// bind next/prev img
function hookBtn() {
	$('#thumbs li img').filter('#play_prev,#play_next').bind('click',
			function() {
				if (timer) {
					clearTimeout(timer);
				}
				var id = this.id;
				if (id == 'play_prev') {
					index--;
					if (index < 0)
						index = 6;
				} else {
					index++;
					if (index > 6)
						index = 0;
				}
				rechange(index);
				slideImage(index);
				timer = window.setTimeout(auto, offset);
			});
}
// get index
function getIndex(v) {
	for (var i = 0; i < target.length; i++) {
		if (target[i] == v)
			return i;
	}
}
function rechange(loop) {
	var id = 'thumb_' + target[loop];
	$('#thumbs li a.current').removeClass('current');
	$('#' + id).addClass('current');
}
function auto() {
	index++;
	if (index > 4) {
		index = 0;
	}
	rechange(index);
	slideImage(index);
	timer = window.setTimeout(auto, offset);
}
$(function() {
			if (typeof(target) != 'undefined') {
				if (target) {
					$('div.word').css({
								opacity : 0.85
							});
					auto();
					hookThumb();
					hookBtn();
				}
			}

		});