Your code is like this:
<div id="box"></div>
and you want to put a minimum height on the div called 'box'. Put the following code into your CSS:
#box {
/* sets max-height for IE */
height: expression( this.scrollHeight > 332 ? "333px" : "auto" );
/* sets max-height value for all standards-compliant browsers */
max-height: 333px;
}