generateImg($_GET['file'], $_GET['thumb']);

function generateImg($img, $thumb) {
	
	global $gallery_root, $pictwidth, $pictheight, $thumbwidth, $thumbheight;
		
	if($thumb) {
	$height = $thumbheight;
	$width = $thumbwidth;
	} else {
	$height = $pictheight;
	$width = $pictwidth;
	}
	
	$img = $gallery_root.$img;
	$path = pathinfo($img);
	switch(strtolower($path["extension"])){
		case "jpeg":
		case "jpg":
			Header("Content-type: image/jpeg");
			$img=imagecreatefromjpeg($img);
			break;
		case "gif":
			Header("Content-type: image/gif");
			$img=imagecreatefromgif($img);
			break;
		case "png":
			Header("Content-type: image/png");
			$img=imagecreatefrompng($img);
			break;
		default:
			break;			
	}
	$xratio = $width/(imagesx($img));
	$yratio = $height/(imagesy($img));

	if($xratio < 1 || $yratio < 1) {
		if($xratio < $yratio)
			$resized = imagecreatetruecolor($width,floor(imagesy($img)*$xratio));
		else
			$resized = imagecreatetruecolor(floor(imagesx($img)*$yratio), $height);
		
		imagecopyresampled($resized, $img, 0, 0, 0, 0, imagesx($resized)+1,imagesy($resized)+1,imagesx($img),imagesy($img));
			
		imagejpeg($resized);
		imagedestroy($resized);
	}
	else
	{
		imagejpeg($img);
	}
	imagedestroy($img);		
}