ASP.NET Button won't style in IE6/7

I have several buttons in my ASP.NET page that I am styling using a CSS.
<asp:Button id="Button2" runat="server" Text="Button" CssClass="RegularButton"></asp:Button>

.RegularButton {

This works fine on my development laptop (IE8) but just displays a standard button with no style in IE6 and IE7. I am using it in a .NET 1.1 website but I don't think this should make any difference should it?
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MattWilkinsonAuthor Commented:
I have found the solution - it was in the declaration of the style sheet in the page header - when I dragged this in VS gave me this:
<LINK rel="stylesheet" type="text/css" href="http://localhost/Touchscreens/Styles.css">
But I changed this to the VS2008 default:
<link href="Styles.css" rel="stylesheet" type="text/css" />

and it now works!

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