function writeCookie()
{
 var today = new Date();
 var the_date = new Date("December 31, 2023");
 var the_cookie_date = the_date.toGMTString();
 var the_cookie = "screen_width="+ screen.width;
 var the_cookie = the_cookie + ";expires=" + the_cookie_date;
 document.cookie=the_cookie
}