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)) );
}

// esempio ->  var cookie= getCookie( 'name' );


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;
 }

// esempio ->  setCookie( 'name', 'valore', 10 );


function delCookie(name, path, domain) {
 if (getCookie(name)) document.cookie = name + "=" +
 ( (path) ? ";path=" + path : "") +
 ( (domain) ? ";domain=" + domain : "") +
 ";expires=Thu, 01-Jan-70 00:00:01 GMT";
 }
 
//esempio delCookie( 'name' );