//写cookies函数
function SetCookie(name,value)//两个参数，一个是cookie的名子，一个是值
{
    var Time = 30; //此 cookie 将被保存分钟
    var exp = new Date();    //new Date("December 31, 9998");
    exp.setTime(exp.getTime() + Time*60*1000);
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}

function getCookie(name)//取cookies函数 
{
    var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
     if(arr != null) return unescape(arr[2]); return null;
}

function delCookie(name)//删除cookie
{
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval=getCookie(name);
    if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}


function getParam(name){
	var params=location.search.substring(1).toLowerCase();
	var paramList=[];
	var param=null;
	var parami;
	if(params.length>0) {
		if(params.indexOf("&") >=0) {
   			paramList=params.split( "&" ); 
		}else {
   			paramList[0] = params;
		}
		for(var i=0,listLength = paramList.length;i<listLength;i++) {
	   		parami = paramList[i].indexOf(name+"=" );
   			if(parami>=0) {
    			param =paramList[i].substr(parami+(name+"=").length);
   			}
		}
	}
	return param;
}