// JScript source code
var phone_field_length = 0;
function TabNext(obj, event, len, next_field) 
{
	if (event == "down") 
	{
		phone_field_length=obj.value.length;
	}

	if (event == "up") 
	{
		if (obj.value.length != phone_field_length) 
		{
			phone_field_length=obj.value.length;
			if (phone_field_length >= len) 
			{
				next_field.focus();
			}
		}
	}
}