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';

 	}

}

function show_submenu(id) {
	
	document.getElementById(id).style.display = "block";
	
}
function hide_submenu(id) {
	
	document.getElementById(id).style.display = "none";
	
}
function change_a(id, item) {

	document.getElementById(id+"_left_"+item).style.backgroundImage = "url(images/submenu2_left.jpg)";
	document.getElementById(id+"_right_"+item).style.backgroundImage = "url(images/submenu2_right.jpg)";
	
}
function rechange_a(id, item) {

	document.getElementById(id+"_left_"+item).style.backgroundImage = "url(images/submenu1_left.jpg)";
	document.getElementById(id+"_right_"+item).style.backgroundImage = "url(images/submenu1_right.jpg)";
	
}