this one is for a song, but modify as needed

Code:
; update the trackbar with song
alias trackbar.update {
  if ($dialog([color:Red]dialog[/color])) {
    if ($insong) /did -i [color:Red]dialog[/color] [color:green]id[/color] 1 params [color:blue]$insong.pos 1 $sound($insong.fname).length[/color]
    else /did -i [color:Red]dialog[/color] [color:green]id[/color] 1 params [color:blue]1 1 100[/color]
  }
  ; dialog is closed
  else .timer[color:Red]dialog[/color] off
}

-KingTomato