var isNull  = function(a){ return typeof a == "object" && !a; };

function getParameter(parameter, url){
		return isNull(url.match(new RegExp("[?#&]"+parameter+"=(.*?)(?:[#&]|$)", "i"))) ? "" : RegExp.$1;
}

var $P = function(parameter, url){
	url = url || window.location.href;
	return getParameter(parameter, url);
};

function showtab(btnid,tabid,tabnumber)
{
	for (i = 1;i<=tabnumber;i++)
	{

		document.getElementById(tabid+"_btn"+i).className = "";
		document.getElementById(tabid+"_sub"+i).style.display = "none";
		document.getElementById("help_content"+i).style.display = "none";
	}
	document.getElementById(tabid+"_btn"+btnid).className = "select";
	document.getElementById(tabid+"_sub"+btnid).style.display = "block";
	document.getElementById("help_content"+btnid).style.display = "block";
}

window.onload = function() {
	var links = document.getElementsByTagName("a");
	for(var i=0; i < links.length; i ++) {
	links[i].setAttribute("title",links[i].firstChild.nodeValue);
	}
}
function getDownloadUrl(productName) {
			var random = parseInt(Math.random()*100);
			var temp = 0;
	
			for(var i = 0; i < productName.length && random > temp; i++) {
				temp += parseInt(productName[i].percent);
			}
			i = (random == 0 ? 0 : i - 1);

			return "<a href=\"" + productName[i].url + "\" id='corp_down' target='_blank'>" + productName[i].name + " </a>";
}
var thunderWeb = [
{
name: "泡泡网下载",url: "http://download.pcpop.com/Down/91233.html",percent: 10
},{
name: "新浪下载",url: "http://down1.tech.sina.com.cn/download/down_page/1151164800/28372.shtml",percent: 10
},{
name: "天极下载",url: "http://www.mydown.com/soft/258/258921.html",percent: 15
},{
name: "中关村在线下载",url: "http://xiazai.zol.com.cn/detail/21/201505.shtml",percent: 15
},{
name: "太平洋下载",url: "http://dl.pconline.com.cn/html_2/1/89/id=37363&pn=0.html",percent: 20
},{
name: "IT168下载",url: "http://download.it168.com/01/0122/13588/13588_4.shtml",percent: 15
},{
name: "IT世界网",url: "http://download.it.com.cn/softweb/software/network/download/20067/17900.html",percent: 15
}];
var thunderClient = [
{
name: "ZDNet下载",url: "http://down.zdnet.com.cn/detail/9/85252.shtml",percent: 5
},{
name: "新浪下载",url: "http://down1.tech.sina.com.cn/download/down_page/1082217600/2612.shtml",percent: 10
},{
name: "泡泡网下载",url: "http://download.pcpop.com/Down/49569.html",percent: 15
},{
name: "IT168下载",url: "http://down.it168.com/01/0122/19711/19711_4.shtml",percent: 10
},{
name: "太平洋下载",url: "http://dl.pconline.com.cn/html_2/1/89/id=42443&pn=0.html",percent: 30
},{
name: "网易学院频道",url: "http://tech.163.com/school/thunder/",percent: 10
},{
name: "中关村在线下载",url: "http://xiazai.zol.com.cn/detail/14/135373.shtml",percent: 10
},{
name: "天极下载",url: "http://www.mydown.com/soft/network/download/229/408729.shtml",percent: 10
}];