Changing width on the front page PS 1.4

[iown]

I am trying to get only the centre colum on the front page in PS 1.4. I have the following code.
In the footer TPL:
{if !$content_only}

{if $page_name != 'index'}
<!-- Right -->

{$HOOK_RIGHT_COLUMN}

<!-- Footer -->

{$HOOK_FOOTER}

{/if}
</body>
</html>
In the header TPL:

{if $page_name != 'index'}
<!-- Left -->

{$HOOK_LEFT_COLUMN}

In global CSS:
}
#center_column
body#index #center_column { width: 980px }[H1]
{
width: 556px;
margin: 0 0 30px 0;
overflow: hidden
}
Am I missing something?
Thanks Keith