function imgShow(name) {  // Bild groß anzeigen
  var w,h,x,y
  if (document.all) {
    // Größe des Objekts ermitteln
    eval("h = document.all." + name + ".offsetHeight")
    // Scrollstatus: linke obere Ecke ermitteln
    y = Math.floor(document.body.scrollTop + ((document.body.clientHeight - h) / 2))
    x=11
    if (y<0) y=10
    // neue Position setzen
    eval("document.all." + name + ".style.left = " + x)
    eval("document.all." + name + ".style.top = " + y)
    // Bild einblenden
    eval("document.all." + name + ".style.visibility = 'visible'")
  } else if (document.layers) {
    // Mitte ermitteln und 100 abziehen
    y = window.pageYOffset + 10
    x=11
    if (y<0) y=10
    eval("document." + name + ".left = " + x)
    eval("document." + name + ".top = " + y)
    eval("document." + name + ".visibility = 'visible'")
  } else if (document.getElementById) {
    h = document.getElementById(name).offsetHeight
    x = 11
    y = Math.floor(window.pageYOffset + (window.innerHeight - h) / 2)
    if (y<0) y=10
    document.getElementById(name).style.left = x
    document.getElementById(name).style.top = y
    document.getElementById(name).style.visibility = "visible"
  }
}

function imgHide(name) {  // Bild verdecken
  if (document.all) {
    eval("document.all." + name + ".style.visibility = 'hidden'")
  } else if (document.layers) {
    eval("document." + name + ".visibility = 'hidden'")
  } else if (document.getElementById) {
    document.getElementById(name).style.visibility = "hidden"
  }
}