jquery.validate patch to work with check_box tag in rails

diff --git a/jquery.validate.js b/jquery.validate.js
index c77350c..f9a940f 100644
--- a/jquery.validate.js
+++ b/jquery.validate.js
@@ -488,9 +488,12 @@ $.extend($.validator, {
 		check: function( element ) {
 			element = this.clean( element );
 			
-			// if radio/checkbox, validate first element in group instead
+			// if radio/checkbox, validate first visible element in group instead
 			if (this.checkable(element)) {
-				element = this.findByName( element.name )[0];
+				var elementsByName = this.findByName( element.name )
+				element = $.grep(elementsByName, function(el) {
+							return $(el).is(":visible")
+						})[0] || elementsByName[0]
 			}
 			
 			var rules = $(element).rules();