function checkForm() {
  var strFehler='';
  if (document.forms[0].name.value=="")
    strFehler += "Name\n";
  if (document.forms[0].vname.value=="")
    strFehler += "Vorname\n";
  if (document.forms[0].strasse.value=="")
    strFehler += "Strasse\n";
  if (document.forms[0].ort.value.length<6)
    strFehler += "PLZ \ Ort\n";
  if (document.forms[0].telefon.value.length<10)
    strFehler += "Telefon\n";
  if (!validEmail(document.forms[0].email.value)) {
    strFehler += "Email Adresse\n";


  }
    
  if (strFehler.length>0) {
    alert("Bitte füllen Sie folgende Felder korrekt aus: \n"+strFehler);
    return(false);
  }
}
function validEmail(email) {
  var strReg = "^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$";
  var regex = new RegExp(strReg);
  return(regex.test(email));
}
function openwin(href,width,height ) { 
	var SollBreite = width;
	var SollHoehe = height;
	var xPos = (screen.width - SollBreite) / 2;
	var yPos = (screen.height - SollHoehe) / 2;

 
	F1= window.open(href,"silvermoon","top="+yPos+", left="+xPos+", width="+width+", height=" + height + ", resizable=no, scrollbars=no");
}

function openwin2(href,width,height ) { 
	var SollBreite = width;
	var SollHoehe = height;
	var xPos = (screen.width - SollBreite) / 2;
	var yPos = (screen.height - SollHoehe) / 2;

 
	F1= window.open(href,"silvermoon","top="+yPos+", left="+xPos+", width="+width+", height=" + height + ", resizable=yes, scrollbars=yes");
}


function openwindow(href,width,height) { 
	var SollBreite = width;
	var SollHoehe = height;
	var xPos = (screen.width - SollBreite) / 2;
	var yPos = (screen.height - SollHoehe) / 2;

 
	F1= window.open(href,"Silvermoon","top="+yPos+", left="+xPos+", width="+width+", height=" + height + ", resizable=yes, scrollbars=yes");
}