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plugins/jquery-validation/additional/skip_or_fill_minimum.js

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+/*
+ * Lets you say "either at least X inputs that match selector Y must be filled,
+ * OR they must all be skipped (left blank)."
+ *
+ * The end result, is that none of these inputs:
+ *
+ *	<input class="productinfo" name="partnumber">
+ *	<input class="productinfo" name="description">
+ *	<input class="productinfo" name="color">
+ *
+ *	...will validate unless either at least two of them are filled,
+ *	OR none of them are.
+ *
+ * partnumber:	{skip_or_fill_minimum: [2,".productinfo"]},
+ * description: {skip_or_fill_minimum: [2,".productinfo"]},
+ * color:		{skip_or_fill_minimum: [2,".productinfo"]}
+ *
+ * options[0]: number of fields that must be filled in the group
+ * options[1]: CSS selector that defines the group of conditionally required fields
+ *
+ */
+$.validator.addMethod( "skip_or_fill_minimum", function( value, element, options ) {
+	var $fields = $( options[ 1 ], element.form ),
+		$fieldsFirst = $fields.eq( 0 ),
+		validator = $fieldsFirst.data( "valid_skip" ) ? $fieldsFirst.data( "valid_skip" ) : $.extend( {}, this ),
+		numberFilled = $fields.filter( function() {
+			return validator.elementValue( this );
+		} ).length,
+		isValid = numberFilled === 0 || numberFilled >= options[ 0 ];
+
+	// Store the cloned validator for future validation
+	$fieldsFirst.data( "valid_skip", validator );
+
+	// If element isn't being validated, run each skip_or_fill_minimum field's validation rules
+	if ( !$( element ).data( "being_validated" ) ) {
+		$fields.data( "being_validated", true );
+		$fields.each( function() {
+			validator.element( this );
+		} );
+		$fields.data( "being_validated", false );
+	}
+	return isValid;
+}, $.validator.format( "Please either skip these fields or fill at least {0} of them." ) );