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