selector {
height: 10em; /* min-height for IE. Must be declared above declaration for other browsers! */
}
selector:empty {
min-height: 10em; /* min-height for browsers other than IE */
height: auto !important; /* Override previously declared height for browsers other than IE */
}
 
or even simpler:

selector {
min-height: 10em; /* min-height for browsers other than IE */
height: auto !important; /* Override declared height for browsers other than IE */
height: 10em; /* min-height for IE */
}

cross-browser minimum height

css, ie

CSS