// Set a cookie 
function setCookie(name, value, expires, path, domain, secure) { 
// set time, it's in milliseconds 
var today = new Date(); 
today.setTime(today.getTime()); 

if (expires) { 
expires = expires * 1000 * 60; 
} 
var expires_date = new Date(today.getTime() + (expires)); 
document.cookie = name + "=" + escape(value) + 
((expires) ? ";expires=" + expires_date.toGMTString() : "") + 
((path) ? ";path=" + path : "") + 
((domain) ? ";domain=" + domain : "") + 
((secure) ? ";secure" : ""); 
} 

// Get the specified cookie 
function getCookie(name) { 

var dc = document.cookie; 
var start = dc.indexOf(name + "="); 
var len = start + name.length + 1; 

if ((!start) && 
(name != dc.substring(0, name.length))) { 
return null; 
} 

if (start == -1) return null; 
var end = dc.indexOf( ";", len ); 
if (end == -1) end = dc.length; 
return unescape(dc.substring(len, end)); 
} 

// Indicate that user visited the logon page. 
function newSession() { 
setCookie("visitedloginscreen", "yes", "", "/", "", ""); 
} 

// Indicate that the password entered is valid. 
function passwordValidated() { 
setCookie("passwordisvalid", "yes", "", "/", "", ""); 
} 

// Check whether user visited logon page. 
function checkSession() { 
if (getCookie("visitedloginscreen") != "yes") { 
top.location.href="illegalaccess.html"; 
} 
} 

// Check whether user entered valid password. 
function checkValidation() { 
if (getCookie("passwordisvalid") != "yes") { 
top.location.href="illegalaccess.html"; 
} 
} 

// Check if cookies are enabled on client browser. 
function isCookiesEnabled() { 
setCookie("cookiesenabled", "yes", "", "/", "", ""); 
if (getCookie("cookiesenabled") != "yes") { 
return -1; 
} else { 
return 0; 
} 
}