function $(tagId) {
	return document.getElementById(tagId);
}

function rollOver(obj) {
	$('navi-ul-' + obj).style.visibility = 'visible';
}

function rollOut(obj) {
	$('navi-ul-' + obj).style.visibility = 'hidden';
}

function arrow(num) {
	$('arrow' + num).style.backgroundImage = 'url(imgs/navi_arrow_on.gif)';
	
}

function naviOn(num) {
	$('arrow' + num).style.backgroundImage = 'url(imgs/navi_arrow_on.gif)';
	
}

function naviOff(num) {
	$('arrow' + num).style.backgroundImage = 'url(imgs/navi_arrow.gif)';
}

function openDisclaimer() {
	window.open('disclaimer.html', 'disclaimer', 'width=330,height=120,scrollbars=no');
}