function getElementsByIdTagAndClassName(id,tag,cname) {
 var tags=document.getElementById(id).getElementsByTagName(tag);
 var cEls=new Array();
 for (i=0; i<tags.length; i++) {
  var rE=new RegExp("(^|\s)" + cname + "(\s|$)");
   if (rE.test(tags[i].className)) {
   cEls.push(tags[i]);
   }
  }
 return cEls;
}
 var ccn="clicker";
 var clcn="closed";
 var opcn="open";

function toggleNextPlusMinus(el) {
 var next=el.nextSibling;
 el.className=el.className.replace(new RegExp(opcn+"\\b"), "");
 el.className=el.className.replace(new RegExp(clcn+"\\b"), "");
 while(next.nodeType != 1) next=next.nextSibling;
 next.style.display=((next.style.display=="block") ? "none" : "block");
 el.className+=((next.style.display=="none")? " "+clcn : " "+opcn);
}
function toggleNextByIdTagAndClassName2(id,tag,cname) {
 clickers=getElementsByIdTagAndClassName(id,tag,cname);
 for (i=0; i<clickers.length; i++) {
  clickers[i].className+=" "+ccn;
  clickers[i].className+=" "+clcn;
  clickers[i].onclick=function() {toggleNextPlusMinus(this)}
  toggleNextPlusMinus(clickers[i]);
 }
}

window.onload=function(){toggleNextByIdTagAndClassName2('byidtagandclass2','div','mapOpen')}