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//Funktion zum Skalieren von Bilddateien
function resize_image($max_size,$srcfile,$destfile) {
	$im_old = ImageCreateFromJPEG($srcfile);
	$size_im_old = getimagesize($srcfile);
	if($size_im_old[0] > $max_size || $size_im_old[1] > $max_size) {
		if($size_im_old[0] > $size_im_old[1]) {
			$size_x_new = $max_size;
			$size_y_new = ($size_x_new*$size_im_old[1])/$size_im_old[0];
		} else {
			$size_y_new = $max_size;
			$size_x_new = ($size_y_new*$size_im_old[0])/$size_im_old[1]; 
		}
	} else {
		$size_y_new = $size_im_old[1];
		$size_x_new = $size_im_old[0];
	}
	$im_new = imagecreate($size_x_new,$size_y_new);
	ImageCopyResized($im_new,$im_old,0,0,0,0,$size_x_new,$size_y_new,ImageSX($im_old),ImageSY($im_old));
	ImageJPEG($im_new,$destfile);
	ImageDestroy($im_new);
}