Lua [tfs 1.4.2] Close ModalWindow when player walk away

[Darekzio]

Hello, i need script onStep that only players with level higher than 150 can go, the players with level below getting stepback from the floor and receive modalwindow message that their level is too low. If The player move or walk away the modalwindow are closed automaticaly

currently i have

<movevent type="StepIn" actionid="17000" event="script" value="leveltile.lua" />

function onStepIn(cid, item, position, fromPosition)
    if getPlayerLevel(cid) > 150 then
            doPlayerSendTextMessage(cid, "Good Luck.")
        else
            doPlayerSendCancel(cid, "You need to be level 150")
            doTeleportThing(cid, fromPosition)
        end
        return true
end