I don't use/have IE6 so I'm not sure what the problem is, but I suspect it is probably these two declarations in
checkout_confirmation.css and checkout_success.css
.progressbar_active {
background: url(../images/orderstep.png) repeat-x;
background-color: #3DA200; /* Determines the active color of the completed part of the line */
width:25%;
float:left;
height: 5px;
color: #3DA200;
}
.progressbar_inactive {
background: url(../images/orderstep.png) repeat-x;
background-color: #9A9A9A; /* Determines the active color of the completed part of the line */
width:25%;
float:left;
height: 5px;
color: #9A9A9A;
}
specifically the highlighted portions.
play around with those by reducing the percentages a little at a time and see if that corrects the problem.
Look at this thread for ways to incorporate specific IE6 stylesheets into your site.
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