Simpleviewer gallery Page width restricted by non-existing sidebars

This WP Page (Picture gallery) uses a Simpleviewer gallery. Although I use a ‘No sidebars’ template page, the gallery width is restricted to that of 1024 minus 2 x sidebar widths. When I remove the two sidebars from the theme, the gallery shows in it’s intended width. But I want sidebars on all the other pages apart from the gallery page.

Any help, suggestions or pointers are much appreciated ??

Simpleviewer Gallery definition:
<simpleviewerGallery maxImageWidth=”750″ maxImageHeight=”650″ textColor=”0xf8f8f8″ frameColor=”0xf8f8f8″ frameWidth=”5″ stagePadding=”20″ navPadding=”20″ thumbnailColumns=”5″ thumbnailRows=”1″ navPosition=”top” vAlign=”top” hAlign=”center” enableRightClickOpen=”false” title=”” imagePath=”https://www.zouchangcheng.com/wordpress/wp-content/photos/xxx/reg/&#8221; thumbPath=”https://www.zouchangcheng.com/wordpress/wp-content/photos/xxx/tn/&#8221; wpSimpleviewerWidth=”850″ wpSimpleviewerHeight=”800″ wpSimpleviewerBackgroundColor=”343434″>

The Page html. Have hard inserted a frame, but all the same, the gallery width remains tiny ??

<table border=0 width=1000 style=’table-layout:fixed’>
<col width=1000>
<tr>
<td>[svgallery name=”September”]</td>
</tr>
</table>