Google’s Site Search tool can, under certain setting, result in an invalid get data error due to semicolons in the resulting urls. Derek supplied a fix involving using a placeholder and then replacing the semicolon.
See forum thread:
http://expressionengine.com/forums/viewthread/94103/#476659
If you do run into this issue, you can can work around it by:
1. Placing the js on your site rather than linking to it
2. Modifying the js to replace the semicolon a la:
function v(){var c=document.location.search;if(c.length<1)return"";c = c.replace(/_SEMICOLON_/, ';');c=c.substring(1,c.length);
3. In the search form, alter the hidden field so that the semicolon is replaced by the placeholder- a la:
<input type="hidden" name="cof" value="FORID:11_SEMICOLON_NB:1" />