Make padding on #squeeze conditional

The central #squeeze div adds padding to both sides. If you've only got one sidebar, or none, this is needless and adds a gap down the side of the page.

It would be better to make it conditional on the sidebars, like this:

#squeeze {
  position: relative;
  padding: 0;
}

/* And add blanks left and right for the sidebars to fill */
body.sidebar-left #squeeze {
  margin-left: 210px;
  padding-left:1em;
}
body.sidebar-right #squeeze {
  margin-right: 210px;
  padding-right:1em;    
}
body.both-sidebars #squeeze {
  margin: 0 210px;
  padding-left:1em;
  padding-right:1em;    
}

(Sorry, not sure about the version of Zen I'm using. The creation date on my zen folder is 04 October 2007.)