var breite,hoehe;
function bildhoehe(){
    if (self.innerHeight) // all except Explorer
    {
    hoehe = self.innerHeight;
    }
    else if (document.documentElement && document.documentElement.clientHeight) // Explorer 6 Strict Mode
      {
      hoehe = document.documentElement.clientHeight;
      }
      else if (document.body) // other Explorers
	{
	hoehe = document.body.clientHeight;
	}
    if (hoehe <= 450) {hoehe = 450}
    divheight = hoehe - 185;
    divhleft = hoehe - 209;
    divhright = hoehe -209;
    document.getElementById("mitte").style.height = divheight+"px";
    document.getElementById("mitte-left").style.height = divhleft+"px";
    document.getElementById("mitte-right").style.height = divhright+"px";
    }

function bildbreite(){
    if (self.innerWidth) // all except Explorer
    {
    breite = self.innerWidth;
    }
    else if (document.documentElement && document.documentElement.clientWidth) // Explorer 6 Strict Mode
      {
      breite = document.documentElement.clientWidth - 30;
      }
      else if (document.body) // other Explorers
	{
	breite = document.body.clientWidth;
	}
    if (breite <= 790) {breite =790}
    mar = (breite - 788) / 2;
    document.getElementById("root").style.margin = "0 "+mar+"px 0 "+mar+"px";
    }

var rotate_delay = 5000;
   current = 0;

function next() {
if (document.screenform.slide[current+1]) {
document.images.bild.src = document.screenform.slide[current+1].value;
document.screenform.slide.selectedIndex = ++current;
   }
else first();
}
function previous() {
if (current-1 >= 0) {
document.images.bild.src = document.screenform.slide[current-1].value;
document.screenform.slide.selectedIndex = --current;
   }
else last();
}
function first() {
current = 0;
document.images.bild.src = document.screenform.slide[0].value;
document.screenform.slide.selectedIndex = 0;
}
function last() {
current = document.screenform.slide.length-1;
document.images.bild.src = document.screenform.slide[current].value;
document.screenform.slide.selectedIndex = current;
}
function ap(text) {
document.screenform.slidebutton.value = (text == "Stop") ? "Start" : "Stop";
rotate();
}
function change() {
current = document.screenform.slide.selectedIndex;
document.images.bild.src = document.screenform.slide[current].value;
}
function rotate() {
if (document.screenform.slidebutton.value == "Stop") {
current = (current == document.screenform.slide.length-1) ? 0 : current+1;
document.images.bild.src = document.screenform.slide[current].value;
document.screenform.slide.selectedIndex = current;
window.setTimeout("rotate()", rotate_delay);
   }
}
function chkFormular() {
  if (document.demo.Famname.value == "") {
    alert("Bitte Ihren Namen eingeben!");
    document.demo.Famname.focus();
    return false;
    }
  if (document.demo.Strasse.value == "") {
    alert("Bitte Ihre Strasse eingeben!");
    document.demo.Strasse.focus();
    return false;
    }
  if (document.demo.PLZ.value == "") {
    alert("Bitte Ihre Postleitzahl eingeben!");
    document.demo.PLZ.focus();
    return false;
    }
  if (document.demo.ORT.value == "") {
    alert("Bitte Ihren Ort eingeben!");
    document.demo.ORT.focus();
    return false;
    }
  if (document.demo.Tel.value == "") {
    alert("Bitte Ihre Telefonnummer eingeben!");
    document.demo.Tel.focus();
    return false;
    }
  if (document.demo.Mail.value == "") {
    alert("Bitte Ihre E-Mail-Adresse eingeben!");
    document.demo.Mail.focus();
    return false;
    }
  if (document.demo.Mail.value.indexOf("@") == -1) {
    alert("Keine E-Mail-Adresse!");
    document.demo.Mail.focus();
    return false;
    }
}