title: window.showModalDialog dialogHeight / dialogWidth don't appear to be working in IE 8
body: <p>Having been marooned on IE 6 for 10 years the company I work for has suddenly announced that we're migrating to IE 8 for our intranet apps.  Having taken a quick look all seems to work fine in IE 8 for ours but there seems to be a quirk with window.showModalDialog that I was wondering if anyone could help with?</p>
  
  <p>Basically the code below is executed in IE6 and opens up a window of the width / height I would expect:</p>
  
  <pre><code>//Set options
  var sOptions = 'dialogWidth:247px; dialogHeight:181px; dialogLeft:100px; dialogTop:100px; status:no; scroll:no; help:no; resizable:yes';
  
  //Open dialog
  var oValue = window.showModalDialog(sURL, null, sOptions);
  </code></pre>
  
  <p>However, in IE 8 (or I guess IE 7 given that on intranet apps it will be forced to "Compatibility Mode") the dialog is opened with a larger width / height.</p>
  
  <p>Does anyone know what might be causing this?  I've a vague idea there might be a minimum width / height being enforced but I can't find any documentation to back this up...</p>