function events_menu() {
	  if (!document.getElementsByTagName) return false;
	  var sub_div = document.getElementById('sub_content');
	  var lnks = sub_div.getElementsByTagName("a");
	  for (var i=0; i<lnks.length; i++) {
				lnks[i].onclick = function() {
			//alert(this.previousSibling.nodeName);
					var the_href = this.getAttribute("href") ; //.indexOf("=") ;
					var the_hash = the_href.lastIndexOf("#");
					var the_underscore = the_href.lastIndexOf("_");					
					var the_div = the_href.substring(the_hash+1, the_underscore);
					dyna_hider();					
					document.getElementById(the_div).style.display='block';
				return false;
			}
	  }
}

function dyna_hider() {
	  var cont_div = document.getElementById('main_content');
	  var divs = cont_div.getElementsByTagName("div");
	  for (var j=0; j<divs.length; j++) {
		  if(divs[j].className == 'dynamic_hide') {
		  divs[j].style.display='none';
		  }
	  }
}