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

function overThumb(thumb) {
	var mainImg = $('main_image');
	var largeCurrent = mainImg.src;
	var largeSel = getLargeFilename(thumb.src);
	if (largeSel != largeCurrent) {
		mainImg.src = largeSel;
		setTimeout(checkLoad, 50);
	}
}

function checkLoad() {
	if ($('main_image').complete) {
		$('wait_image').style.display = 'none';
	}
	else {
		if ($('wait_image').style.display == 'none')
			$('wait_image').style.display = '';
		
		setTimeout(checkLoad, 50);
	}
}

function getLargeFilename(small) {
	var idx = small.indexOf('-small.jpg');
	if (idx != -1)
		return small.substring(0, idx) + '-large.jpg';
	else
		return small;
}