// Slide show
/*========== Home banner's SlideShow=========*/
//banner slide show
var banners = new Array();
banners[0] = ["http://image.linkchina.com/buyer/temp_img/slide_show/banner_3.jpg","http://www.linkchina.com/s_c_08.html"];
banners[1] = ["http://image.linkchina.com/buyer/temp_img/slide_show/welcome.jpg","http://www.linkchina.com/register/register.do"];
banners[2] = ["http://image.linkchina.com/buyer/temp_img/slide_show/banner_2.jpg","http://www.linkchina.com/s_c_02.html"];
banners[3] = ["http://image.linkchina.com/buyer/temp_img/slide_show/banner_1.jpg","http://www.linkchina.com/s_c_03.html"];
var preloadedimages = new Array();
for(i=1;i<banners.length;i++){
	preloadedimages[i]=new Image();
	preloadedimages[i].src = banners[i][0];
}
var num = 0;
var trans_num = 0;
var firstplay = true;
var playTrans = null;
function playBanner(){
	if(num < banners.length-1){
		num ++;
	}else{
		num = 0;
	}
	if(!firstplay){
		var bg_num = num - 1;
		if(bg_num < 0) bg_num = banners.length-1;
		document.getElementById("banner_link").style.background = "url("+ banners[bg_num][0] +")";
	}
	trans_num = 0;
	setTransition();
	document.images["banner_image"].src = banners[num][0];
	document.getElementById("banner_link").href = banners[num][1];
	playTransition();
	setTimeout("playBanner()",15000);
	firstplay = false;
}
function setTransition(){
	var bnr = document.images["banner_image"];
	if(trans_num >100){
		clearInterval(playTrans);
		trans_num = 0;
		return;
	}
	if(document.all){
		bnr.style.filter = "alpha(opacity="+trans_num+")";
	} else {
		bnr.style.opacity = trans_num / 100;
	}
	trans_num = trans_num + 5;
	//document.title = trans_num;
}
function playTransition(){
	playTrans = setInterval("setTransition()",50);
}