CSS and <div>'s - Matching heights on two columns.

[I Will Make It]

I have a (left) navigation div
I have a (right) body div

I want the navigation div to follow the body's height.

Does anyone know how to do this?

My code:

#container {
width: 725px;
margin-left: 20px;
text-align: left;
background: #FFFFFF;
}

#left-column {
border-style: solid; border-color: #73B2FF; border-width: 0px 1px 1px 1px; background-color: #D3E4FF;
float: left;
width: 170px;
height: 100%;
}

#content {
float: right;
width: 550px;
background: #FFFFFF;
padding-top: 15px;
}

[I Will Make It]

Sorry guys...

didn't see bc2planker's post before now.
Why? My post was moved by moderator.