var sg_images;
var sg_num_images;
var sg_cur_image = 0;
Event.observe(window,'load',function() {
	sg_images = $$('.sg_item');
	sg_num_images = sg_images.size();
        
	//setTimeout('nextSGImage()', 20000);
});
function nextSGImage() {
        new Effect.Fade(sg_images[sg_cur_image], { duration: 0.3 });
	if(sg_cur_image == (sg_num_images-1)) {
		sg_cur_image = 0;
	} else {
	//	sg_cur_image = Math.floor(Math.random()*sg_num_images);
                sg_cur_image++;
	}
        if(sg_cur_image<0 || sg_cur_image>sg_num_images-1)
              sg_cur_image = 0;
	new Effect.Appear(sg_images[sg_cur_image], { duration: 0.3 });
	//setTimeout('nextSGImage()', 20000);
}