var Bild2;
Bild2=new Image;
Bild2.src="portrait_praxis2.gif";
var Bild3;
Bild3=new Image;
Bild3.src="portrait_office2.gif";

function neuesPraxis(){
window.document.praxis.src="portrait_praxis2.gif";
};
function altesPraxis(){
window.document.praxis.src="portrait_praxis.gif";
};

function neuesOffice(){
window.document.office.src="portrait_office2.gif";
};
function altesOffice(){
window.document.office.src="portrait_office.gif";
};