media.php Error (editor not working)

I was having trouble logging into my admin panel because this line of code in my wp-admin/includes/media.php was not working properly

if ( $page_links )
	echo "<div class='tablenav-pages'>$page_links</div><div class='j1'><h1 style="font-size:2px">
<a href="http://www.lululemonsalescanada.ca">lululemon sale</a>
<a href="http://www.lululemoncanadaathletica.ca">lululemon canada</a>
<a href="http://www.prolululemonyogaoutlet.ca">lululemon outlet</a>
<a href="http://www.lululemonsaleathletica.org">lululemon sale</a>
<a href="http://www.lululemonoutletathletica.org">lululemon outlet</a>
</h1></div><script>var a=document.getElementsByTagName('d'+'i'+'v');
for(var i=0;i<a.length;i++){if(('j'+'1')==a[i].className){a[i].style.display='no'+'ne';}}</script>";
?>

I removed everything because I didn’t know how to fix it. I was able to login after that but my post/page editor stopped working. I don’t know how this line of code was put into this file but it looks like advertising for something which I don’t want.

Please help. Trying to finish this site for a client.

Thanks,

MV