yui3 issue #1300 - images should not be used to draw triangles. we have css!

Hi @allenrabinovich,

I sent a pull request to dev-3.x for the following issue: https://github.com/yui/yui3/issues/1300


![dan_medium](https://f.cloud.github.com/assets/1154834/1308960/47276a02-31d7-11e3-8ccd-4d70118ced59.gif)