Can't part of my first plugin (mask) to work?

I am creating my first plugin and decided to try and create a mask plugin that would use the # character as the mask character. So if I called:

 ('input').mask('(###)-###-####');

The mask would become ( )- -

All #'s would be replaced by spaces so only the mask would show. I sort of skipped ahead of this and just wanted to see if as I get the keypress to work. What I wanted to do was as the user types a character, I want to put there character at the first occurrence of the # character. This is how I want it to be, the mask starts of as ( )- -. If the user types a 3, then it should display (3 )- -. Next, it might be something like (35 )- -. This goes on until the mask is complete. The below scripts is not very good and is probably not the best way to go at it, but just remember I am just trying to learn.

(function($) {
$.fn.mask = function(options) {

var
    defaults = {
        mask: '',
        maskColor: '#c4c4c4',
        inputColor: '#000000'
    },
    settings = $.extend({},defaults,options);

    this.keypress(function(e)
    {
        var text = '';
        var length = settings.mask.length;

        for(var i = 0; i < length; i++)
        {
            var c = settings.mask.charCodeAt(i);

            if(c != '35') //35 is the # character
            {

                text += settings.mask.charAt(i); /*Trying to do (342)-292-2029  
                                                 for example, but after the  
                                                 first character, it does 
                                                 ()-()-()3 instead. */
            }
        }
        $(this).val(text);
    });
}
})(jQuery);开发者_StackOverflow中文版   

---

I played around with this a little bit here http://jsfiddle.net/gJ68n/ This could certainly be optimized, but I think it might get you moving in the right direction.