// JavaScript Document
function show_hide(op)
{
	var el_submenu;
	var el_sign;	
	
	el_submenu = document.getElementById(op + '_submenu');
	el_sign = document.getElementById(op + '_sign');
	
	if(el_submenu.style.display == 'none' || el_submenu.style.display == '')
	{
		el_submenu.style.display = 'block';
		el_sign.src = '/images/minus.gif';
	}else{
		el_submenu.style.display = 'none';
		el_sign.src = '/images/plus.gif';
	}
	
	return;
}