Can't figure out what to do with Element functions&Markers

[TheMtaUser555]

This is a mode, which a crook tries to escape the cops. What I can't get to work is the leaveMarker function. A cylinder is attached to the crook when it spawns(it's suposed to be invisible, I didn't add the alpha thing yet tho), when the crook gets far away from the cops( all the cops) and they leave the marker, after 10 secs a message should appear, like "escaped" or something. And another thing I wanted to do is when the crook gets surrounded by the cops(another marker attached to the crook, a smaller one), wich when a cop stays within the marker, for atleast 10 secs, a message should appear, like "busted".

I would really appreciate your help! I just can't figure out what I'm suposed to do.

  
  
---this part works fine: 
  
policeVehicles = { [416]=true,[574]=true, [433]=true, [427]=true, [490]=true, [528]=true, [407]=true, [544]=true, [523]=true, [470]=true, [598]=true, [596]=true, [597]=true, [599]=true, [432]=true, [601]=true, [428]=true, [497]=true, [510]=true, [564]=true}   
  
function enterspawn (theVehicle, seat, jacked)  
local copVehicle = ( policeVehicles[getElementModel(theVehicle)] ) 
    if not copVehicle then 
      createBlipAttachedTo ( theVehicle, 55, 1 ) 
      local name = getPlayerName ( source ) 
      local r, g, b = getPlayerNametagColor ( source ) 
      outputChatBox("***"..name.." is the crook***", getRootElement(), r, g, b, true ) 
       local x, y, z = getElementPosition ( theVehicle ) 
      local theMarker = createMarker ( x , y , z, "cylinder", 20, 255, 255, 0, 170 ) 
       attachElements ( theMarker, theVehicle,0,0,0 ) 
       else 
       cancelEvent() 
       end 
  
end 
  
addEventHandler ( "onPlayerVehicleEnter", getRootElement(), enterspawn ) 
  
---here doesn't, I don't understand why, I tried: 
function MarkerLeave( leaveElement, matchingDimension )  
if  getElementType( leaveElement ) == "vehicle" and  copVehicle 
then 
    setTimer(MarkerLeave,10000,0, "escaped") 
    else cancelEvent() 
end 
end 
addEventHandler( "onMarkerLeave",getRootElement(),  MarkerLeave )function 

[arezu]

attaching a marker doesn't work because of mta bug (the marker changes position only visually) use colshape instead.