var isNN = (navigator.appName.indexOf("Netscape")!=-1);

function autoTab(input, len, e, gotoMonth) {

	evt = (e) ? e : event;
	var charCode = (evt.charCode) ? evt.charCode : 
		((evt.keyCode) ? evt.keyCode : 
		 ((evt.which) ? evt.which : O));
	if(charCode > 31 
			&& input.value.length == len) {
		if(!gotoMonth)
			input.form[(getIndex(input)+1) % input.form.length].focus();
		else
			input.form[12].focus();
	}
	
	/*
	var keyCode = (isNN) ? e.which : e.keyCode;
	//var filter = (isNN) ? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46];

	if(keyCode > 31 
			&& input.value.length >= len
			&& !containsElement(filter,keyCode))
	{
		input.value = input.value.slice(0, len);
		if(!gotoMonth)
			input.form[(getIndex(input)+1) % input.form.length].focus();
		else
			input.form[12].focus();
	}
	*/
	
	function containsElement(arr, ele) {
		var found = false, index = 0;
		while(!found && index < arr.length)
			if(arr[index] == ele)
				found = true;
			else
				index++;
		return found;
	}
	
	function getIndex(input) {
		var index = -1, i = 0, found = false;
		while (i < input.form.length && index == -1)
			if (input.form[i] == input)
				index = i;
			else 
				i++;
		return index;
	}
	
	return true;
}