Este es el codigo que me da google por si sirve de algo, no sirve con modificar el tamaño ese de 800.
Cita: <!-- Google Search Result Snippet Begins --><!-- Google Search Result Snippet Ends -->
<div id="cse-search-results"></div> <script type="text/javascript">
var googleSearchIframeName = "cse-search-results";
var googleSearchFormName = "cse-search-box";
var googleSearchFrameWidth = 800;
var googleSearchDomain = "www.google.com";
var googleSearchPath = "/cse";
</script> <script type="text/javascript" src="http://www.google.com/afsonline/show_afs_search.js"></script>