integer CHANNEL = 42; // dialog channel
list MENU_MAIN = ["Floor 1", "Floor 2", "Floor 3", "Floor 4", "Floor 5", "Floor 6", "Floor 7", "Floor 8", "Floor 9", "Floor 10","Roof"];
float target;
float BOTTOM = 22.260;
default
{
    state_entry()
    {
         llListen(CHANNEL, "", NULL_KEY, "");
    }
     listen(integer channel, string name, key id, string message) 
        {
            integer idx = llListFindList(MENU_MAIN, [message]);
            if( idx!=-1 )
            {
                llSay(0,"Elevator heading to " + message + "." );
                target = BOTTOM + (idx*10);
            } 
        }

     changed(integer Change)
    {
         llDialog(llAvatarOnSitTarget(), "Where to?", MENU_MAIN, CHANNEL);
    }
}