function createCookie(name, value, days) {
   if (days) {
      var date = new Date();
      date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
      var expires = "; expires=" + date.toGMTString();
   } else {
      var expires = "";
   } 
   document.cookie = name + "=" + value + expires + "; path=/";
}

function readCookie(name) {
   var nameEQ = name + "=";
   var ca = document.cookie.split(';');
   for (var i = 0; i < ca.length; i++) {
      var c = ca[i];
      while (c.charAt(0) == ' ') {
         c = c.substring(1, c.length);
      } 
      if (c.indexOf(nameEQ) == 0) {
         return c.substring(nameEQ.length, c.length);
      } 
   }
   return null;
}

function eraseCookie(name) {
   createCookie(name, "", -1);
}

function go(link){
   document.location.href = link;
}

function show_element(id, visible) {
   if (visible) {
      jQuery('#' + id).show();
   } else {
      jQuery('#' + id).hide();
   }
   return false;
}

function change_design(design) {
   createCookie('design', design, 30);
}