function hideMenu(){
	objs = getElementsByClass("subMenu");
	for(i=0;i<objs.length;i++){
            objs[i].style.display = "none";
	}
}

function showSubMenu(n){
	hideMenu();
        obj = document.all["subMenu"+n];
	if(obj)	obj.style.display = 'block';
}


function getElementsByClass(searchClass,node,tag) {
  var classElements = [];
  if ( node == null )
    node = document;
  if ( tag == null )
    tag = '*';
  var els = node.getElementsByTagName(tag);
  var elsLen = els.length;
 
  var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
  for (i = 0, j = 0; i < elsLen; i++) {
    if ( pattern.test(els[i].className) ) {
      classElements[j++] = els[i];
    }
  }
  return classElements;
}