function changemain(id) {
	$("div[id*='main_']").hide();
	$(id).show();
}		

function openexternal(url){
	window.open(url);
	return false;
}

function init_menu_internal(name) {
	$('#menu_'+name).click(function () {
		changemain('#main_'+name);
	});				
				
}

function init_menu_external(name, url) {
	$('#menu_'+name).click(function () {
		openexternal(url);
	});				
}