function openPicture(imageName,imageWidth,imageHeight) {
newWindow = window.open("popup.htm","popup","Width="+imageWidth+",Height="+imageHeight+",scrollbars=no,left=100,top=20");
newWindow.document.open();
newWindow.document.write('große Ansicht');
newWindow.document.write('
');
newWindow.document.write('');
newWindow.document.close();
newWindow.focus();
}