Since this is a tutorial, The Professor has used the magenta bar as a spacer so that you could see it. Here is the code used to create this page.
<body background="bbg/wolf-borderv2.jpg" text="#FAF0E6" link="#FAF0E6" vlink="#FAF0E6">
<table cellpadding=0 cellspacing=0 border=0 width="95%">
<tr><td align=left valign=top>
<img src="magenta.gif" height=9 width=130 border=0 alt="spacer">
</td><td align=left valign=top width="100%">
Text and coding go here
</td></tr></table>
For your actual pages you would use a clear spacer gif with a height of 1. The width would be determined by the width of the left border image used. Here is a Clear Spacer Gif for you to Transload.