function left() 
{
	$('showBox_prev').className = 'inactive'; 
	$('showBox_next').className = ''	
}

function right() 
{
	$('showBox_prev').className = ''; 
	$('showBox_next').className = 'inactive';	
}

function chsel(obj) 
{
	el = document.getElementsByClassName('selected');
	el[0].className = '';
	obj.className = 'selected';
}