function addCookie(name,value,expireHours)
{
    var cookieString=name+"="+escape(value);    
    if(expireHours>0)
    {
         var date=new Date();
         date.setTime(date.getTime()+expireHours*3600*1000);
         cookieString=(cookieString+"; path=/; expires="+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 unescape(arr[1]);
    }
    return '';
}

function deleteCookie(name)
{
    var date=new Date();
    date.setTime(date.getTime()-10000);
    document.cookie=(name+'=; expire='+date.toGMTString());
}