Separate IE6 css hacks into an IE-specific stylesheet

[joshlory]

We're using the * html css hack [1] to conditionally apply the tab.gif image in IE6 and tab.png in all other browsers. Eventually these hacks should be pulled out into an IE-specific stylesheet and conditionally included [2], e.g:

<!--[if IE 6]>
<link rel="stylesheet" href="(location of IE-specific stylesheet)" 
    type="text/css" />
<![endif]-->

[1] http://centricle.com/ref/css/filters/
[2] http://www.quirksmode.org/css/condcom.html

I created a style-ie6.css and used conditions to load it in each html file, I'll push it onto the git when I figure out how, keep getting a "no fast forward" error, but even after pulling I can't seem to push right to yours, and mine says its up to date heh.

issue is currently fixed for the index animals and aboutus pages AFAIK. I commited the changed to your git, sorry for all the comments. If you can take a look at them and make sure they work, we can close the issue (these still need to be added to the stories and wishlist pages assuming its right).

[joshlory]

Looks good, the only thing I changed was 7bd1b21.