(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);