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; 
} 
  
function SetCookie (name, value) { 
    var argv = SetCookie.arguments; 
    var argc = SetCookie.arguments.length; 
    var expires = (argc > 2) ? argv[2] : null; 
    var path = (argc > 3) ? argv[3] : null; 
    var domain = (argc > 4) ? argv[4] : null; 
    var secure = (argc > 5) ? argv[5] : false; 
  
    document.cookie = name + "=" + escape (value) + 
    ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + 
    ((path == null) ? "" : ("; path=" + path)) + 
    ((domain == null) ? "" : ("; domain=" + domain)) + 
    ((secure == true) ? "; secure" : ""); 
} 
  
function DeleteCookie (name) { 
    var exp = new Date(); 
    exp.setTime (exp.getTime() - 1); 
    var cval = GetCookie (name); 
    document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString(); 
} 
  
function getCookieVal(offset) { 
    var endstr = document.cookie.indexOf (";", offset); 
    if (endstr == -1) 
    endstr = document.cookie.length; 
    return unescape(document.cookie.substring(offset, endstr)); 
}