function switchProject(menuNum) {
	// erase selected for all others
	$$('div.menu_item').each(function(e) {
		e.removeClassName('selected');
	});
	
	// select the particular menu item
	var e = $$('div.menu_item')[menuNum];
	e.addClassName('selected');
		
	// hide other project divs
	$$('div#right_content .project').each(function(e) {
		e.hide();
	});
	
	// switch project div
	$('project_' + menuNum).show();
}