var doit = true
function showx(ob,pict) {
  if(doit) {
    document.getElementById(ob).style.height = '920'
    document.getElementById(pict).src = 'arrow5.gif'
    doit = false
  }
  else {
    document.getElementById(ob).style.height = '23'
    document.getElementById(pict).src = 'arrow4.gif'
    doit = true
  }
}