function showLayer(item){
	if (item != 'sub_'){
		document.getElementById(item).style.display='block';
	}
}

function resetMenu(item){
	if (item != 'sub_'){
		document.getElementById(item).style.display='block';
	}
}

function showImage(item){
		document.getElementById(item).style.background = 'url(../images/buttons/'+item+'_rollover.gif) no-repeat';
}