function availability_banner() {
	if (!document.getElementsByClassName) return false;
	if (!document.getElementsByClassName('adverts_table_image')) return false;
	
	var $image_containers = document.getElementsByClassName('adverts_table_image');
	for (var $i=0; $i<$image_containers.length; $i++) {
		var $image_container = $image_containers[$i];
		var $banner = document.createElement('div');
		$banner.className = "availability_banner banner-"+($image_container.className.substr(33,1));
		$image_container.getElementsByTagName('a')[0].insertBefore($banner,$image_container.getElementsByTagName('a')[0].firstChild);
	}
}
addLoadEvent(availability_banner);