The only way I can see that being possible with your HTML structure is absolutely positioning the element.
#col1 {
top: 420px; /* Add this */
position: absolute; /* And this */
width: 236px;
background-color: rgb(204, 227, 251);
}
However this is really just a hack. You should restructure your HTML. AACC is not a good example - they use tables for their layout. Look at how stackoverflow create their sidebar for a better example.