Currently, I am integrating Google Custom Search (Business Edition) into my website using the Custom Element instead of the iFrame. I chose a theme that looks great on all browsers except for IE6. In IE6, the search results are displaying with the Promotion CSS.
Latest Code Update
<div id="cse-search-form" style="width: 100%;">Loading</div>
<script src="http://www.google.com/jsapi" type="text/javascript"></script>
<script type="text/javascript">
google.load('search', '1');
google.setOnLoadCallback(function() {
var customSearchControl = new google.search.CustomSearchControl('XXXXXXXX');
customSearchControl.setResultSetSize(google.search.Search.FILTERED_CSE_RESULTSET);
var options = new google.search.DrawOptions();
options.setSearchFormRoot('cse-search-form');
options.setAutoComplete(true);
customSearchControl.draw('cse', options);
}, true);
</script>
<link rel="stylesheet" href="http://www.google.com/cse/style/look/minimalist.css" type="text/css" />
<div id="cse" style="width:100%;"></div>