Javascript in a Blogger post

I tried putting in some custom javascript into just a single Blogger post earlier, and simply couldn't understand why I couldn't get it working. It turns out I'd simply forgotten that Blogger, even in 'Edit HTML' mode automagically adds in <br /> tags for line breaks. As such, I ended up with the following when I went to 'view source':

<script language="javascript"> <br />
function toggleLayer( whichLayer ) <br />
{ var elem, vis; <br />
if( document.getElementById ) <br />
// this is the way the standards work <br />
elem = document.getElementById( whichLayer ); <br />
else if( document.all )

... and on. Not the best code I'm sure you'll agree. Hope this help anyone else with the same problem :)