function $() {
	var elements = new Array();
	for (var i = 0; i < arguments.length; i++) {
		var element = arguments[i];
		if (typeof element == 'string')
			element = document.getElementById(element);
		if (arguments.length == 1)
			return element;
		elements.push(element);
	}
	return elements;
}

function showUses() {
	$('startSlide').style.display = 'none';
	$('nextSlide').style.display = 'block';
	$('slides').src = '/images/intro_uses-000.png';
}

function hideUses() {
	$('nextSlide').style.display = 'none';
	$('startSlide').style.display = 'block';
	$('slides').src = '/images/intro_what-001.png';
}

var slideNum = 1;
function nextSlide() {
	if (slideNum==10) {
		slideNum = 0;
		hideUses();
	} else {
		$('slides').src = '/images/intro_uses-00' + slideNum + '.png';
	}	
	slideNum++;
}