function init() {
    updateExternalLinks();
}

function showHideSubmenu(id){
	if(document.getElementById('submenu_'+id).style.display=='none'){
		document.getElementById('submenu_'+id).style.display='';
	} else {
		document.getElementById('submenu_'+id).style.display='none';
	}
}

function updateExternalLinks() {
 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 = init;