function openFenster(link,fenster,weite,hoehe)
  {
  open(link,fenster,"width="+weite+",height="+hoehe+", resizable=yes,toolbar=no,scrollbars=yes,screenX=300,screenY=200");
  }  
function openFenster2(link,fenster,weite,hoehe)
  {
  open(link,fenster,"width="+weite+",height="+hoehe+", location=yes,menubar=yes,resizable=yes,toolbar=yes,scrollbars=yes,screenX=100,screenY=100");
  }
  
function einblenden(div) {
with(document.getElementById(div).style){
if(display=="none"){
display="inline";
}
else{
display="none";
}
}
}


function auswahl()
{
    if (document.duo.elements[0].checked) {
	document.forms[1].elements[2].disabled=false;
	document.forms[1].elements[4].disabled=false;
	document.forms[1].elements[6].disabled=false;
	}
	else {
		document.forms[1].elements[2].disabled=true;
		document.forms[1].elements[4].disabled=true;
		document.forms[1].elements[6].disabled=true;
		}
}

<!--[if lt IE 7]>
if(window.navigator.systemLanguage && !window.navigator.language) {
  function hoverIE() {
    var LI = document.getElementById("Navigation").firstChild;
    do {
      if (sucheUL(LI.firstChild)) {
        LI.onmouseover=einblenden; LI.onmouseout=ausblenden;
      }
      LI = LI.nextSibling;
    }
    while(LI);
  }

  function sucheUL(UL) {
    do {
      if(UL) UL = UL.nextSibling;
      if(UL && UL.nodeName == "UL") return UL;
    }
    while(UL);
    return false;
  }

  function einblenden() {
    var UL = sucheUL(this.firstChild);
    UL.style.display = "block"; UL.style.backgroundColor = "silver";
  }
  function ausblenden() {
    sucheUL(this.firstChild).style.display = "none";
  }

  window.onload=hoverIE;
}
<!--[endif]-->