/**

*  ensure specified input fields will accept those predefined values

*  two configurable options

*  1. allow: only those specified within this option will be acceptable

*  2. disallow: anything (or only those specified within allow option if allow option isn't empty)

*               will be acceptable except those specified within this option

*/

jQuery.fn.inputValue = function(options)

{

	var settings = jQuery.extend({allow:'', disallow:''}, options);

	return jQuery(this).keypress

		(

			function (e)

				{

					if (!e.charCode)

						var code = String.fromCharCode(e.which);

					else

						var code = String.fromCharCode(e.charCode);

					if(code && (typeof(e.keyCode) == 'undefined' || (e.keyCode != 8 && e.keyCode != 46)))

					{

						if(settings.allow.length != 0 && settings.disallow.length != 0)

						{

							if(settings.allow.indexOf(code) == -1)

							{

								e.preventDefault();

							}else if(settings.disallow.indexOf(code) != -1)

							{

								e.preventDefault();

							}

						}else if(settings.allow.length != 0)

						{

							if(settings.allow.indexOf(code) == -1)

							{

								e.preventDefault();

							}

						}else if(settings.disallow.length != 0)

						{

							if(settings.disallow.indexOf(code) != -1)

							{

								e.preventDefault();

							}

						}

					}

					if (e.ctrlKey && code=='v')

						e.preventDefault();

					$(this).bind('contextmenu',function () {return false});

				}

		);



};

/**

*	input fields will accept valid email address

*/

jQuery.fn.inputEmail = function()

{

		return this.each (function()

			{

				jQuery(this).inputValue({allow:'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ@.0123456789'});

			}

		);

};

/**

*	input fields will accept digits only

*/

jQuery.fn.inputInteger = function()

{

		return this.each (function()

			{

				jQuery(this).inputValue({allow:'9876543210'});

			}

		);

};

/**

*	input fields will accept digits and dots.

*/

jQuery.fn.inputFloat = function()

{

		return this.each (function()

			{

				jQuery(this).inputValue({allow:'0123456789.'});

			}

		);

};

/**

*	input fields will accept all letters (case insensitive)

*/

jQuery.fn.inputLetter = function()

{

		return this.each (function()

			{

				jQuery(this).inputValue({allow:'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'});

			}

		);

};