function isNull(_sVal){
	return (_sVal === "" || _sVal == null || _sVal == "undefined");
}

function Cookie()
{
	this.setcookie = function(n, v, e, p){
		var cookiestr = n + "=" + escape(v) + "; ";
		if (!isNull(e) && !isNaN(e)){
			var d=new Date();
			d.setTime(d.getTime() + e * 1000);
			cookiestr += "expires=" + d.toGMTString() + "; ";
		}
		cookiestr += "domain=yes.com.cn; ";
		if (!isNull(p)){
			cookiestr += "path=" + p + "; ";
		}
		else{
			cookiestr += "path=/; ";
		}
		document.cookie = cookiestr;
	}
	this.getcookie = function(n){
		var aCookie = document.cookie.split("; ");
		for (var i=0; i < aCookie.length; i++){
			var aCrumb = aCookie[i].split("=");
			if (n == aCrumb[0]){
				return unescape(aCrumb[1]);
			}
		}
		return null;
	}
	this.delcookie = function(n){
		document.cookie = n + "=" + null + "; domain=yes.com.cn; path=/; expires=Fri, 31 Dec 1999 23:59:59 GMT;";
	}
}