Calendar.setup({
    inputField  : "start",         // ID of the input field
    ifFormat    : "%d.%m.%Y",    // the date format
    button      : "startTrigger"       // ID of the button
});
Calendar.setup({
    inputField  : "stop",         // ID of the input field
    ifFormat    : "%d.%m.%Y",    // the date format
    button      : "stopTrigger"       // ID of the button
});