/*---------- shop ----------*/
agt = window.navigator.userAgent.toLowerCase();
isIE = (agt.indexOf('msie') >= 0 && agt.indexOf('opera') < 0) ? true : false;

function showmenu(num) {

	var menu = document.getElementById('menu_'+num);

	if (isIE) {
		var a = menu.attributes.getNamedItem('class');
		a = (a) ? a.value : menu.attributes['class'];
	} else {
		var a = menu.getAttribute('class');
	}

	var newCls = 'sub '+((a != 'sub invisible') ? 'invisible' : 'sub-selected-cat');

	if (isIE) {
		var a = menu.attributes.getNamedItem('class');
		a.value = newCls;
	} else {
		menu.setAttribute('class',newCls);
	}
}