Problem with 2 column layout with different type widths

[m_leefs]

I'm trying to make a 2 col layout with the right column a fixed width (180px) and the left column to fill the rest of the page. The following css works for most of the time, but when the browser window is narrowed the right column jumps under the left column. I've tried to mess around with it the best I've could with no success. Any suggestions would be greatly appreciated.

#masthead{
padding: 10px 0px 0px 0px;
border-bottom: 1px solid #cccccc;
width: 100%;
}

#navBar{
float: right;
width: 180px;
margin: 0px;
padding: 0px;
border-left: 1px solid #cccccc;
border-bottom: 1px solid #cccccc;
}

#content{
float:left;
width: 75%;
margin: 0px;
padding: 5px 10px 5px 5px;
}

[bill]

Try the layout suggested in this thread: [Tableless layout] Two divs withs with right aligment [webmasterworld.com]. It will probably work better for you.