$(document).ready(function() {

	$('#btnAdd').click(function() {
		var num		= $('.clonedInput').length;	// how many "duplicatable" input fields we currently have
		var newNum	= new Number(num + 1);		// the numeric ID of the new input field being added

		// create the new element via clone(), and manipulate it's ID using newNum value
		var newElem = $('#input' + num).clone().attr('id', 'input' + newNum);

		// manipulate the name/id values of the input inside the new element
		newElem.children().attr('id', 'file' + newNum).attr('name', 'file' + newNum).attr('value','');

		// insert the new element after the last "duplicatable" input field
		$('#input' + num).after(newElem);

		// increment filenum
		$('#filenum').val(newNum);
		
		// enable the "remove" button
		$('#btnDel').attr('disabled','');

		// business rule: you can only add 5 names
	});

	$('#btnDel').click(function() {
		var num	= $('.clonedInput').length;	// how many "duplicatable" input fields we currently have
		$('#input' + num).remove();		// remove the last element

		// enable the "add" button
		$('#btnAdd').attr('disabled','');

		// if only one element remains, disable the "remove" button
		if (num-1 == 1)
			$('#btnDel').attr('disabled','disabled');
	});

	$('#btnDel').attr('disabled','disabled');
});