function changeStyle(title) {

   if (document.getElementsByTagName) {

    var i, link;

     for (i=0; (link=document.getElementsByTagName("link")[i]); i++) {
       if (link.getAttribute("rel")!=-1&&link.getAttribute("title")) {
        link.disabled=true;
 
         if (link.getAttribute("title")==title) {
          link.disabled=false;
         }
       }
     }
   }
 createCookie("style",title,30);
 }
  function createCookie(name,value,hours) {
   var expires = "";

    if (hours!=null) {
     expire=new Date((new Date()).getTime() + hours * 3600000);
     expire="; expires="+expire.toGMTString();
    }

       document.cookie=name + "=" + value + expire;
  }

  function readCookie() {
   var cValue=0;
   if (document.cookie.indexOf("a1")!=-1) changeStyle('a1');
   if (document.cookie.indexOf("a2")!=-1) changeStyle('a2');
   if (document.cookie.indexOf("a3")!=-1) changeStyle('a3');
 } readCookie()