(function($){

    $.fn.alphanumeric = function(p) {

        p = $.extend({
            ichars: "!@#$%^&*()+=[]\\\';,/{}|\":<>?~`.- ",
            nchars: "",
            allow: ""
        }, p);

        return this.each
        (
            function() 
            {

                if (p.nocaps) p.nchars += "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
                if (p.allcaps) p.nchars += "abcdefghijklmnopqrstuvwxyz";
					
                s = p.allow.split('');
                for ( i=0;i<s.length;i++) if (p.ichars.indexOf(s[i]) != -1) s[i] = "\\" + s[i];
                p.allow = s.join('|');
					
                var reg = new RegExp(p.allow,'gi');
                var ch = p.ichars + p.nchars;
                ch = ch.replace(reg,'');

                $(this).keypress
                (
                    function (e)
                    {
								
                        if (!e.charCode) k = String.fromCharCode(e.which);
                        else k = String.fromCharCode(e.charCode);
										
                        if (ch.indexOf(k) != -1) e.preventDefault();
                        if (e.ctrlKey&&k=='v') e.preventDefault();
									
                    }
								
                    );
						
                $(this).bind('contextmenu',function () {
                    return false
                });
									
            }
            );

    };

    $.fn.numeric = function(p) {
	
        var az = "abcdefghijklmnopqrstuvwxyz";
        az += az.toUpperCase();

        p = $.extend({
            nchars: az
        }, p);
		  	
        return this.each (function()
        {
            $(this).alphanumeric(p);
        }
        );
			
    };
	
    $.fn.alpha = function(p) {

        var nm = "1234567890";

        p = $.extend({
            nchars: nm
        }, p);

        return this.each (function()
        {
            $(this).alphanumeric(p);
        }
        );
			
    };

})(jQuery);