First, open the theme.skin file and find the
<portal:OuterWrapperPanel... control. Remove
art-content from the CssClass property.
Next, within the layout.master file, find the
<portal:LayoutPanel... control with
<div class="art-content"> directly before the
<asp:ContentPlaceHolder... control within this LayoutPanel. Next, enter
</div> directly after the closing
</asp:ContentPlaceHolder> within this same LayoutPanel.
This should take care of the problem for you. There are better ways to do what Artisteer is doing, without script, but that would take a lot more work and in the end it would be easier to start with our Framework skin and customize it to look like your Artisteer theme.
I hope this helps,