function change(invisible,visible){

//alert(invisible);
//alert(visible);

//document.getElementById(invisible).style.visibility = 'hidden';
//document.getElementById(visible).style.visibility = 'visible';
	
$('cont_04').effect('opacity',{duration: 200}).start(0,1).addEvent('onComplete',function()
	{
		$(invisible).effect('opacity',{duration: 500}).start(1,0);
		$(visible).effect('opacity',{duration: 500}).start(0,1);
		$('cont_04').effect('opacity',{duration: 200}).start(1,0);
	}
);
	


}