//This function provides the autotab ability on inputs. For an example on how to use it see below:
//onkeyup="autoTab(this, 3, event)"
function autoTab(input,len, e) {
	var isNN = (navigator.appName.indexOf("Netscape")!=-1);
	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(input.value.length >= len && !containsElement(filter,keyCode)) {
		input.value = input.value.slice(0, len);
		input.form[(getIndex(input)+1) % input.form.length].focus();
	}
}

//Helper function for autoTab
function containsElement(arr, ele) {
	var found = false, index = 0;
	while(!found && index < arr.length)
	if(arr[index] == ele) {
		found = true;
	} else {
		index++;
	}
	return found;
}

//Helper function for autoTab
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;
}