function switchTabContent(d) {
	$$('div.tab_content').each(function(x){
	Element.hide(x);});
	Element.show(d);
}


Event.observe(window, 'load', function() {


$$('div#tab_menu ul li').each(function(x){
 		
		// ONCLICK  - Add and Remove class on click on the TAB NAVIGATION
		Event.observe(x, 'click', function(){
			$$('div#tab_menu ul li.on').each(function(x){
				Element.removeClassName(x, 'on');
			});
			Element.addClassName(x, 'on');
		});
		
	});//end each li div#tab_menu ul li
	
$$('div#tab_menu ul li p').each(function(x){
	Event.observe(x, 'mouseover', function(){
		Element.addClassName(x, 'hover');
 	});

	Event.observe(x, 'mouseout', function(){
		Element.removeClassName(x, 'hover');	
	});

});//end each li div#tab_menu ul li

});