如何根据我使用的浏览器执行不同的操作？

I'm performing testing with Watir in Chrome Firefox and IE. In both Chrome and Firefox the mouseover event does the trick but in IE I have to use hover. The code works as I've tested it outside of the if statement for all three browsers. I just can't get seem to get this if statement to work properly. Any ideas?I'm performing testing with Watir in Chrome Fir