document.getElementsByClassName = function(cl) {
         var retnode = [];
         var myclass = new RegExp('\\b'+cl+'\\b');
         var elem = this.getElementsByTagName('*');
         for (var j = 0; j < elem.length; j++) {
             var classes = elem[j].className;
             if (myclass.test(classes)) retnode.push(elem[j]);
         }
         return retnode;
     }
    

     function HideAll() {
         var items = document.getElementsByClassName("optiton");
         for (var j=0; j<items.length; j++) {
             items[j].style.display = "none";
         }

     }
    

     function setCookie(sName,sValue,expireHours) {
         var cookieString = sName + "=" + escape(sValue);
         if (expireHours>0) {
              var date = new Date();
              date.setTime(date.getTime + expireHours * 3600 * 1000);
              cookieString = cookieString + "; expire=" + date.toGMTString();
         }
         document.cookie = cookieString;
     }
    
     function getCookie(sName) {
       var aCookie = document.cookie.split("; ");
       for (var j=0; j < aCookie.length; j++){
         var aCrumb = aCookie[j].split("=");
         if (escape(sName) == aCrumb[0])
           return unescape(aCrumb[1]);
       }
       return null;
     }
    
     window.onload = function() {
         var show_item = "opt_1";
         if (getCookie("show_item") != null) {
              show_item= "opt_" + getCookie("show_item");

         }
         document.getElementById(show_item).style.display = "block";
         var items = document.getElementsByClassName("title");
         for (var j=0; j<items.length; j++) {
             items[j].onclick = function() {
                 var o = document.getElementById("opt_" + this.name);
                 if (o.style.display != "block") {
                     HideAll();
                     o.style.display = "block";
                     setCookie("show_item",this.name);
                 }
                 else {
                     o.style.display = "none";
                 }
             }
         }
     }