string WhoDropped;
integer in_use;

RevertToDefault()
{
    llSetText("Touch to drop an item", <1, 1, 1>, 1);
    llSetTimerEvent(0);
    in_use = FALSE;
    llAllowInventoryDrop(FALSE);
}

default
{
    state_entry()
    {
        RevertToDefault();
    }

    touch_start(integer n)
    {
        if (in_use)
        {
            llRegionSayTo(llDetectedKey(0), 0, "Sorry, this drop box is in use. Please wait until it's free.");
            return;
        }
        in_use = TRUE;
        llAllowInventoryDrop(TRUE);
        WhoDropped = llDetectedName(0);
        llSetText(WhoDropped + ", please drop your item in the next 30 seconds.", <1, 1, 1>, 1);
        llSetTimerEvent(30);
    }

    changed(integer change)
    {
        if (change & CHANGED_ALLOWED_DROP)
        {
            RevertToDefault();
            llInstantMessage(llGetOwner(), WhoDropped + " dropped an item!");
        }
    }

    timer()
    {
        RevertToDefault();
    }
}