Remove a previous result head, if found.

www/searchFunc.js

@@ -130,6 +130,7 @@ UNL_Search.onSearchComplete = function(control, searcher) {
 	
 	if (searcher.cursor.estimatedResultCount) {
 		var $resultHead = $("<div />").addClass('result_head').text('About ' + searcher.cursor.estimatedResultCount + ' results');
+		$('.result_head', control.root).remove();
 		$('.gsc-results', control.root).before($resultHead);
 	}