(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);
			}
		);
			
	};	
	
	$.fn.email = 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});
				});
		};


})(jQuery);