When I wget your page (yumalibrary.org/public), I can see it:
<div id='hideMe'><p>The drugs also treat..........................Buy branded vi a gr a</a> .</p></div>
<script type='text/javascript'>
if(document.getElementById('hideMe') != null){
document.getElementById('hideMe').style.visibility = 'hidden';
document.getElementById('hideMe').style.display = 'none';
}
</script>
Keep in mind that this code does not have to be on the server in plain text, but if you use any server-side scripting, such as PHP, it can be inserted via some obfuscation (base64, gzinflate, rot13, ...).