Added support to change default placeholder.

use: $.mask.placeholder = '-';
P.S.This way $(element).mask('99-99',{placeholder: '_'}); is valid too

Author: nerijunior

src/jquery.maskedinput.js

@@ -7,15 +7,16 @@
 (function($) {
 	var pasteEventName = ($.browser.msie ? 'paste' : 'input') + ".mask";
 	var iPhone = (window.orientation != undefined);
-
+ 
 	$.mask = {
 		//Predefined character definitions
 		definitions: {
 			'9': "[0-9]",
 			'a': "[A-Za-z]",
 			'*': "[A-Za-z0-9]"
 		},
-		dataName:"rawMaskFn"
+		dataName: "rawMaskFn",
+		placeholder: '_',
 	};
 
 	$.fn.extend({
@@ -54,7 +55,7 @@
 				return input.data($.mask.dataName)();
 			}
 			settings = $.extend({
-				placeholder: "_",
+				placeholder: $.mask.placeholder, // Load default placeholder
 				completed: null
 			}, settings);