Here's my code

.contentdivone
{
float:left;
width:400px;
}
.contentdivtwo
{
float:left;
width:150px;
}

This works great, but my problem here is when I make the window smaller the contentdivtwo moves below contentdivone.  What I want is a scroll bar to appear so that the two columns are always next to each other.

Any ideas?

So something like

<div id="container">
<div id="leftside" class="contentdivone">Something</div>
<div id="rightside" class="contentdivtwo">Something else</div>
</div>

Should work for you fine.