Cookies

function cookiesAllowed() {
   setCookie('checkCookie', 'test', 1);
   if (getCookie('checkCookie')) {
      deleteCookie('checkCookie');
      return true;
   }
   return false;
}
 
function setCookie(name,value,expires, options) {
   if (options===undefined) { options = {}; }
   if ( expires ) {
      var expires_date = new Date();
      expires_date.setDate(expires_date.getDate() + expires)
   }
   document.cookie = name+'='+escape( value ) +
      ( ( expires ) ? ';expires='+expires_date.toGMTString() : '' ) + 
      ( ( options.path ) ? ';path=' + options.path : '' ) +
      ( ( options.domain ) ? ';domain=' + options.domain : '' ) +
      ( ( options.secure ) ? ';secure' : '' );
}
 
function getCookie( name ) {
   var start = document.cookie.indexOf( name + "=" );
   var len = start + name.length + 1;
   if ( ( !start ) && ( name != document.cookie.substring( 0, name.length ) ) ) {
      return null;
   }
   if ( start == -1 ) return null;
   var end = document.cookie.indexOf( ';', len );
   if ( end == -1 ) end = document.cookie.length;
   return unescape( document.cookie.substring( len, end ) );
}
 
function deleteCookie( name, path, domain ) {
   if ( getCookie( name ) ) document.cookie = name + '=' +
      ( ( path ) ? ';path=' + path : '') +
      ( ( domain ) ? ';domain=' + domain : '' ) +
      ';expires=Thu, 01-Jan-1970 00:00:01 GMT';
}
 
 
// Usage:
// Check if cookies are allowed in this browser.
if cookiesAllowed() { 
  alert('you can set cookies');
} else {
  alert("This browser doesn't allow cookies.");
}
 
// Create a cookie named myCookie with a value of 'Peanut Butter'
// The cookie will expire in 10 days.
setCookie('myCookie','Peanut Butter', 10);
 
// Retreive the value of 'myCookie'
var userCookie = getCookie('myCookie');
 
// Delete 'myCookie'
deleteCookie('myCookie');