function digg_protect($content) {
	include("htmlparser.inc");																			// Include the class
	$parser = new HtmlParser($content);																	// Create the parser
	while($parser->parse()) {																			// Start parsing the content
		if ($parser->iNodeName = "img") {																// If this node is an image
			if ($parser->iNodeAttributes["src"] && $parser->iNodeAttributes["protect"]) {				// If the "protect" and "src" attributes are both declared
				if (strstr($_SERVER["HTTP_REFERRER"], "digg.com")) {									// If our viewer is visiting from Digg
					$alt = "";
					$width = "";
					$height = "";
					if ($parser->iNodeAttributes["alt"]) {
						$alt = " alt=\"" . $parser->iNodeAttributes["alt"] . "\"";
					}
					if ($parser->iNodeAttributes["width"]) {
						$width = " width=\"" . $parser->iNodeAttributes["width"] . "\"";
					}
					if ($parser->iNodeAttributes["height"]) {
						$height = " height=\"" . $parser->iNodeAttributes["height"] . "\"";
					}
					$tag = "<img src=\"" . $parser->iNodeAttributes["protect"] . "\"" . $alt . $width . $height . " />";
					$new = preg_replace("/protect=(.*?)/i", "", $parser->iNodeValue);
					$new = preg_replace("/src=(.*?)/i", $parser->iNodeAttributes["protect"], $new);
					str_ireplace($parser->iNodeValue, $new, $content);									// Replace the old tag with the new one
				} else {																				// If our viewer isn't visiting from Digg
					$alt = "";
					$width = "";
					$height = "";
					if ($parser->iNodeAttributes["alt"]) {
						$alt = " alt=\"" . $parser->iNodeAttributes["alt"] . "\"";
					}
					if ($parser->iNodeAttributes["width"]) {
						$width = " width=\"" . $parser->iNodeAttributes["width"] . "\"";
					}
					if ($parser->iNodeAttributes["height"]) {
						$height = " height=\"" . $parser->iNodeAttributes["height"] . "\"";
					}
					$tag = "<img src=\"" . $parser->iNodeAttributes["src"] . "\"" . $alt . $width . $height . " />";
					str_ireplace($parser->iNodeValue, $new, $content);									// Replace the old tag with the new one
				}
			}
		}
	}
	return $content;
}

add_filter("the_content", "digg_protect");