function HasItem takes unit whichUnit, integer itemId returns boolean
local integer index=0
    loop
        if ( UnitItemInSlot(whichUnit, index)!= null) and (GetItemTypeId( UnitItemInSlot(whichUnit, index)) == itemId) then
            return true
        endif
        set index = index + 1
        exitwhen index >= 5
    endloop
    return false

function IsItemInInventory takes unit u, integer it returns boolean
  local integer i = 0
  loop
    exitwhen i > 5 or GetItemTypeId(UnitItemInSlot(u, i)) == it
    set i = i + 1
  endloop
  return i < 6
endfunction