/**
 * Restituisce il valore di un cookie
 *
 * @example
 *  var res = getCookie( 'variabile' );
 *
 */
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)) ); 
}





/**
 * Imposta un cookie
 *
 * @example
 *
 * setCookie( 'variabile', 'valore', 10 );
 *
 */
function setCookie(name, value, expiredays, path, domain, secure) {
    var expires = new Date();
    expires.setDate( expires.getDate() + expiredays );
    var cookieString = name + "=" +escape(value) + 
       ( (expires) ? ";expires=" + expires.toGMTString() : "") + 
       ( (path) ? ";path=" + path : "") +        
       ( (domain) ? ";domain=" + domain : "") + 
       ( (secure) ? ";secure" : ""); 
    document.cookie = cookieString; 
}





/**
 * Elimina un cookie
 *
 * @example
 *  deleteCookie( 'variabile' );
 *
 */
function deleteCookie(name, path, domain) { 
   if (getCookie(name)) document.cookie = name + "=" + 
      ( (path) ? ";path=" + path : "") + 
      ( (domain) ? ";domain=" + domain : "") + 
      ";expires=Thu, 01-Jan-70 00:00:01 GMT"; 
}