Meta tags for the description follow the pattern:
<meta name="description" content="Your Content Here
Additionally, make sure they're not too long.
Finally, a master page may be a bad location as each page gets the same description. Preferably, each page should have a unique description.
You may find this an interesting read: http://www.wrox.com/WileyCDA/WroxTit...470131470.html
I know I did.....