(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,'');
					
					$(this).keypress
						(
							function (e)
								{
									if(!$.browser.msie) {
										var	kc = e.keyCode;
										if (kc==8 || kc==9 || kc==13 || (kc>32 && kc<41) || kc==46)
											return true;
									}

									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);