function showMenu (tab,menu,submenu) {
  $('.currenttab').removeClass("currenttab");
  $('.currentmenu').removeClass("currentmenu");
  
  $('#tab'+tab).addClass("currenttab");
  
  if(menu==null) return;
  
  $('#menu'+menu).addClass("currentmenu");
  
  if(submenu==null) return;
}

function externalLinks() {
	 if (!document.getElementsByTagName) return;
	 var anchors = document.getElementsByTagName("a");
	 for (var i=0; i<anchors.length; i++) {
		   var anchor = anchors[i];
		   if (anchor.getAttribute("href") &&
				   anchor.getAttribute("rel") == "external")
			 anchor.target = "_blank";
	 }
}
window.onload = externalLinks;