var maxWidth = 517;

function resizeImage(image) {
	if (image.width > maxWidth)
	{
		if (!image.naturalWidth) {image.naturalWidth = image.width};
		if (!image.naturalHeight) {image.naturalHeight = image.height};

		image.width = maxWidth;
		image.height = Math.floor(image.naturalHeight/(image.naturalWidth/517));
	}
}

function check_images()
{
	count = document.images.length;
	i = 0;

	while(count>i){
		url = document.images[i].src;

		if(url.match(/fotos\//)){
			if(document.images[i].complete){
				resizeImage(document.images[i]);
			}else{
				document.images[i].onload = resizeImage;
			}
		}

		i++;
	}
}