var element_id = 'airplane';
var picture_name = 'Enter_web_1';
var framerate = 50;
var total_pictures = 100;
var loop_number = 0;
function loop_pictures()
{
	element = document.getElementById(element_id);
	
	if (loop_number >= 0 && loop_number <= 9)
		image_url = picture_name + '_000' + loop_number;
	if (loop_number >= 10 && loop_number <= 99)
		image_url = picture_name + '_00' + loop_number;
	if (loop_number >= 100 && loop_number <= 999)
		image_url = picture_name + '_0' + loop_number;
	image_url = 'pics/airplane/' + image_url + '.png';
	
	if (element.innerHTML!='')
		element.innerHTML = '';
	if (loop_number > 7 && loop_number < 98)
		element.style.backgroundImage = 'url(\''+  image_url + '\')';
	if (loop_number >= total_pictures)
		loop_number = 0;
	else
		loop_number++;
	
	setTimeout("loop_pictures()", framerate);
}