<?

if (extension_loaded("gd"))
{
	// Determine php version
	$phpversion = ereg_replace ("([^0-9])", "", phpversion());
	$phpversion = $phpversion / pow (10, strlen($phpversion) - 1);
	
	if ($phpversion >= 4.02)
	{ 
	    // Use ImageTypes() to dermine image format
	    if (ImageTypes() & IMG_PNG)
	        $gdimageformat = "png";
	    
	    elseif (ImageTypes() & IMG_JPG)
	        $gdimageformat = "jpeg";
	    
	    elseif (ImageTypes() & IMG_GIF)
	        $gdimageformat = "gif";
	    
	    else 
	        $gdimageformat = "none";
	}
	elseif ($phpversion >= 4)
	{
		// No way to determine image format
		$gdimageformat = "gif"; // assume gif?
	}
	else
	{ 
	    // Use Function_Exists to determine image format
	    if (function_exists("imagepng"))
	        $gdimageformat = "png"; 
	    
	    elseif (function_exists("imagejpeg"))
	        $gdimageformat = "jpeg"; 
	    
	    elseif (function_exists("imagegif"))
	        $gdimageformat = "gif";
	    
	    else
	        $gdimageformat = "none";
	}
}
else
{
	$gdimageformat = "none";
}


function showimage(&$im)
{
	global $gdimageformat;
	switch($gdimageformat)
	{ 
		case "gif":
			ImageGIF($im);
			break;
		case "jpeg":
			ImageJPEG($im);
			break;
		case "png":
			ImagePNG($im);
			break;
		default:
			// hmm.. what to do here?  
			break; // just break I guess
	}
}
?>