// JavaScript Document
/*
*	Author: Flakron Bytyqi
*	Date: 23.03.2009
*	Version: 1.0.0
*/

$.fn.jField = function(options){
	
	var defaults = {
		allowNegatives: true,
		allowDecimal: true
	};
	
	defaults = $.extend(defaults, options);
	
	$(this).keydown(function(event){
	
		var key = (event.which) ? event.which : event.keyCode;

		if(		(key >= 48 && key <= 57)
			||	(key >= 96 && key <= 105)
			|| 	key == 8
			||	key == 109
			||	key == 190
			||	key == 110
		)
		{	
			if(defaults.allowNegatives == false && key == 109)
			{
				return false;
			}
			else if
			(		
					defaults.allowNegatives == true 
				&& 	$(this).val().length > 0 
				&& 	key == 109
			)
			{
				return false;
			}
			
			if(
					defaults.allowDecimal == false
				&&	(key == 190 || key == 110)
			)
			{
				return false;
			}
			else if(defaults.allowDecimal == true)
			{
				if($(this).val().length == 0)
				{
					if((key == 190 || key == 110))
					{
						return false;
					}
				}
				else
				{
					if((key == 190 || key == 110))
					{
						for(var i = 0; i < $(this).val().length; i++)
						{
							if($(this).val().charAt(i) == ".")
							{
								return false;
							}
						}
					}
				}
			}
		}
		else if(
				key == 37
			||	key == 38
			||	key == 39
			||	key == 40
			||	key == 17
			||	key == 46
			||	key == 116
		)
		{}
		else
		{
			return false;
		}
	});
};