function addCookie(name,value,expireHours){
       var cookieString=name+"="+escape(value);
       //判断是否设置过期时间
	   if(expireHours>0)
		   var date=new Date();
		   date.setTime(date.getTime+expireHours*3600*1000);
		   cookieString=cookieString+";expire="+date.toGMTString();
	   
       document.cookie=cookieString;
}
function getCookie(name){
       var strCookie=document.cookie;
       var arrCookie=strCookie.split("; ");
       for(var i=0;i<arrCookie.length;i++){
             var arr=arrCookie[i].split("=");
             if(arr[0]==name)return arr[1];
       }
       return "";
}
function deleteCookie(name){
        var date=new Date();
        date.setTime(date.getTime()-10000);
        document.cookie=name+"=v; expire="+date.toGMTString();
}

function setcookies(value){
	var alexaCookie="";var tname="";
	var pass=-1;
	//获取cookie字符串
	var strCookie="";
	strCookie=document.cookie;
	//将多cookie切割为多个名/值对
	var arrCookie=strCookie.split("; ");
	var allnum=arrCookie.length;
	for(var i=0;i<allnum;i++){
		alexaCookie=getCookie("alexa_100CEO_"+i);
		if(alexaCookie==value){
			pass=i;
			i=allnum;
		}
	}

	if(pass>=0){
		tname="alexa_100CEO_"+pass;
		deleteCookie(tname);
	}else{
        tname="alexa_100CEO_"+allnum;
	}
	addCookie(tname,value,0);
	
}
function showcookie(sitehost){

	var strCookie=document.cookie;
	//将多cookie切割为多个名/值对
	var arrCookie=strCookie.split("; ");
	var allnum=arrCookie.length;
	var htmlstr="";url="";list=0;
	htmlstr="<table width='100%' cellspacing='0'>";
	for(var i=allnum-1;i>=0;i--){
		var arr=arrCookie[i].split("=");
		url=arr[1];
		if(arr[0]=="alexa_100CEO_"+i){
			htmlstr=htmlstr+'<tr><td class="rank_left">';
			htmlstr=htmlstr+'<a href="'+sitehost+'alexa/'+url+'">'+url+'</a>';
			htmlstr=htmlstr+'</td></tr>';
			list++;
	    }
		if(list>15)i=-1;
	}
	htmlstr=htmlstr+"</table>";
	document.all.cookie_show.innerHTML=htmlstr;
}