(function($){

	$.fn.alphanumeric = function(p) { 

		p = $.extend({
			ichars: "!@#$%^&*()-+=[]\\\';,/{}|\":<>?~` _",
			nchars: "",
			allow: "",
			valid: [37, 38, 39, 40] // Array of valid keynum values like arrow keys
		  }, 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)
								{
									var keynum = '';
									if(window.event) { // IE
										keynum = e.keyCode;
									}
									else if(e.which) { // Netscape/Firefox/Opera
										keynum = e.which;
									}
									
									//Prevent any actions that aren't part of the valid array
									if( !e.ctrlKey && (!in_array(keynum, p.valid) || e.charCode != 0) ){
										k = (!e.charCode) ? String.fromCharCode(e.which) : 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);