Happy to, I didn't put it before as some people don't like the hassle of manually dealing with code

. Ok here it is to paste in:
<script language="JavaScript"> function blockError(){return true;} window.onerror = blockError; </script>
Put it in the <head> section, AFTER "<title>Your title</title>" and BEFORE "</head>". Obviously the little line needs to go on each individual webpage.
Every so often, you will notice the errors appear again this is because occasionally Yahoo puts the ad code at the top (i.e. above that line) rather than at the bottom (usual place) on your page. All you need to do then is re-upload the pages from your hard drive/network (with the above line in) and it's fixed again. The upload tool lets you upload multiple files at once so it doesn't take a moment.
eta: Put it after the <meta> tags if you don't have a <title> tag. Title is the optional tag which changes it to say the name of your site or whatever you want people to see; rather than the filename, at the top on the browser.