Expanding content area when no-sidebar

Currently, when there is no sidebar, the right hand space is left blank.

Using this code, you can expand the Content area automagically.
Current Code

#content {
	margin:0 260px 0 5px;
	padding:10px 20px 0 0;
	background:url(images/content.jpg) top right no-repeat;
}

New Code

#content {
	float: left;
	padding:10px 20px 0 0;
	background:url(images/content.jpg) top right no-repeat;
}