function over_navi(img_name)
{
 picname="pics/" + img_name + "_aktiv.jpg";
 docname="pic_" + img_name;
 document[docname].src = picname;
 return true;
}


function out_navi(img_name)
{
 if (pic_lastclick != img_name)
 {
  picname="pics/" + img_name + ".jpg";
  docname="pic_" + img_name;
  document[docname].src = picname;
 }
 return true; 
} 

function klick_navi(img_name)
{
 if (img_name != pic_lastclick)
 {
  picname="pics/" + img_name + "_aktiv.jpg";
  docname="pic_" + img_name;
  document[docname].src = picname;
  sicpic_lastclick = pic_lastclick;
  pic_lastclick = img_name;
  picname="pics/" + sicpic_lastclick + ".jpg";
  docname="pic_"+sicpic_lastclick;
  document[docname].src = picname;
 }
 return true;
}


 function NeuesFenster (url, w, h) {
  var groesse = "width=" + w + ",height=" + h + ", scrollbars=no";
  var popup = window.open(url,'nfu',groesse);
  popup.focus();
 }