var changeArrow = function(el) {
	el.firstChild.src = '_images/nav/_arrow-down.gif';
	try {
		el.lastChild.setStyle({ paddingLeft: '10px' });
	} catch(err) {}	

}
var changeArrowBack = function(el) {
	el.firstChild.src = '_images/nav/_arrow.gif';
	try {
		el.lastChild.setStyle({ paddingLeft: '0px' });
	} catch(err) {}	
}