Resize a showModalDialog or ShowModelessDialog and have all the content resize as well.

resize.js

size = [640, 480]
if(window.dialogArguments !== null && window.dialogArguments !== undefined) { // Check for IE Window
  window.dialogWidth = size[0] + 'px';
  window.dialogHeight = size[1] + 'px';
  $('*').addClass('ie').removeClass('ie'); // Holy Crap This Works!
} else {
  window.resizeTo(parseInt(size[0], 10), parseInt(size[1], 10) + _windowHeight);
}