So you want to get rid of your left nav in moss.  Well the first way to do this would be to create a webpart page with no nav.

1)View all site content
2)Create
3)Web part page

This one will have no nav so you should be looking good.

Now say this page still doens't work for you, but you don't want to have to work in designer of customize any HTML.  A little trick is to hide some css styles in a content editor web part. Paste this snippit into a it and to-da your left nav will be hidden away

<style>
.ms-quicklaunch
{
display:none;
}
.ms-navframe
{
display: none;
}
.leftNav
{
display: none;
}
.leftNavSpacer
{
display: none;
}
.mainContainer
{
width: 100%
}
</style>