$(document).ready( function() {
if($('.slideshow_box').length != 0) {
	$(window).load(function() {slide();window.setInterval(slide, 3000)});
}
});
	var image_num = 1;
	var prev_image = 0;
	var prev_image_id = '';
	var next_image_id = '';
	function slide() {
		prev_image_id = '#image_'+prev_image;
		next_image_id = '#image_'+image_num;
		$(prev_image_id).fadeOut(500,function() { 
			$(next_image_id).fadeIn(500);
		} );

		prev_image = image_num;
		if(image_num == num_images-1)  {
			image_num=-1;
		}
		++image_num;
	}