// Bildwechsel Home
function BildhighH(welches){
window.document.images[welches].src = "images/nav_"+ welches +"_hi.gif";
}

function BildnormH(welches){
window.document.images[welches].src = "images/nav_"+ welches +".gif";
}

// Bildwechsel Unterseiten
function Bildhigh(welches){
window.document.images[welches].src = "images/nav_"+ welches +"_hi.gif";
}

function Bildnorm(welches){
window.document.images[welches].src = "images/nav_"+ welches +".gif";
}

//external links
function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "external")
     anchor.target = "_blank";
 }
}

window.onload = externalLinks;