function SetCookie(name,value)//两个参数，一个是cookie的名子，一个是值
{
    var Days = 30; //此 cookie 将被保存 30 天
    var exp  = new Date();    //new Date("December 31, 9998");
    exp.setTime(exp.getTime() + Days*24*60*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 styleColor(n){
		var changeStyle=document.getElementById("styleColor");
		var a11=document.getElementById("a11");
		var a12=document.getElementById("a12");
		var a13=document.getElementById("a13");
		if(n==0){
			changeStyle.href="images/css.css";
			a11.className="onblueStyle";
			a12.className="redStyle";
			a13.className="orangeStyle";
			SetCookie('fangan',0)
			}
		if(n==1){
			changeStyle.href="images/css1.css";
			a11.className="blueStyle";
			a12.className="onredStyle";
			a13.className="orangeStyle";
			SetCookie('fangan',1)
			}
		if(n==2){
			changeStyle.href="images/css2.css";
			a11.className="blueStyle";
			a12.className="redStyle";
			a13.className="onorangeStyle";
			SetCookie('fangan',2)
			}
			
	}