function center_popup(url,name,w,h,scroll){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable='
win = window.open(url,name,settings)
if(win.window.focus){win.window.focus();}
}

var out="";
var limg="";


function off() {
  if (out=="") { return; }
  if (document.images) {
    document.images[limg].src=out;
    out="";
  }
}

function on(img,o1,o2) {
  if (document.images) {
  if (out != "") { off(); }
    document.images[img].src=o1;
    out=o2;
    limg=img;
  }
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}


  function chkFormular() {
  
  if (document.formular.email.value == "") {
    alert("Bitte deine E-Mail-Adresse eingeben!");
    document.formular.email.focus();
    return false;
  }
   else if (document.formular.email.value == "deine@email.de") {
    alert("Bitte eine gültige E-Mail-Adresse eingeben!");
    document.formular.email.focus();
    return false;
  }
  else if (document.formular.email.value.indexOf("@") == -1) {
    alert("Deine E-Mail-Adresse ist ungültig!");
    document.formular.email.focus();
    return false;
  }

}