function GetCookieVal(offset)
{
    var endstr = document.cookie.indexOf (";", offset);
    if (endstr == -1)
    endstr = document.cookie.length;
    return unescape(document.cookie.substring(offset, endstr));
}

function SetCookie(name, value)
{
    var expdate = new Date();
    var argv = SetCookie.arguments;
    var argc = SetCookie.arguments.length;
    var expires = (argc > 2) ? argv[2] : null;
    var path = "/";
    var domain = (argc > 4) ? argv[4] : null;
    var secure = (argc > 5) ? argv[5] : false;
    if(expires!=null) expdate.setTime(expdate.getTime() + ( expires * 1000 ));
    document.cookie = name + "=" + escape (value) +((expires == null) ? "" : ("; expires="+ expdate.toGMTString()))
    +((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain))
    +((secure == true) ? "; secure" : "");
    
}

function DelCookie(name)
{
    var exp = new Date();
    exp.setTime (exp.getTime() - (86400 * 1000 * 1));
    var cval = GetCookie (name);
    document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();
    SetCookie(name,"",exp);
}

function DelAllCookie()
{
    var cookie = document.cookie.split( "; "); 
    var s= " "; 
    for(var i=0;i <cookie.length; i ) 
    { 
        s=cookie[i].split( "= ")[0].trim(); 
        if(s== "user ") 
        { 
            var date = new Date(); 
            date.setTime(date.getTime() - (86400 * 1000 * 1)); 
            var expirestr = date.toGMTString(); 
            cookie[i] = "; expires= " +expirestr; 
            document.cookie = cookie[i]; 
        } 
    } 
}

function GetCookie(name)
{
    var arg = name + "=";
    var alen = arg.length;
    var clen = document.cookie.length;
    var i = 0;
    while (i < clen)
    {
    var j = i + alen;
    if (document.cookie.substring(i, j) == arg)
    return GetCookieVal (j);
    i = document.cookie.indexOf(" ", i) + 1;
    if (i == 0) break;
    }
    return null;
}