var pfeil_box_on = "images/nav_p.gif";
            var pfeil_box_off = "images/nav_a.gif"

            function mouseover_box(image_id)
            {
                document.images[image_id].src = pfeil_box_off;
            }

            function mouseout_box(image_id)
            {
                document.images[image_id].src = pfeil_box_on;
            }

            function mouse_hauptbild(image_id)
            {
                document.images["hauptbild"].src = image_id;
            }

            var pageLoaded = false;

            function open( url, pars, name )
            {
                var w = window.open( url, name, pars );
                w.focus();
            }

            function close()
            {
                if ( opener ) opener.focus();
                window.close();
            }

            var imageold = "";

            function imageOn( id, imagenew, layerid )
            {
                if ( !document.images ) return;

                var objDocument = ( layerid && document.layers ) ? document.layers[ layerid ].document : document;

                imageold = objDocument.images[ id ].src;
                objDocument.images[ id ].src = imagenew;
            }

            function imageOff( id, layerid )
            {
                if ( document.images && imageold )
                {
                    var objDocument = ( layerid && document.layers ) ? document.layers[ layerid ].document : document;

                    objDocument.images[ d ].src = imageold;
                    imageold = "";
                }
            }

                  function preload() {
                  this.length = preload.arguments.length;
                  for (var i = 0; i < this .length; i++) {
                  this[i+1] = new Image();
                  this[i+1].src = preload.arguments[i];
                              }
                           }

                  if (document.images && 0) {
                  var pic1 = new preload(
                    "fotos.Referenz1.jpg",
                            "fotos.Referenz2.jpg",
                            "fotos.Referenz3.jpg",
                            "fotos.Referenz4.jpg",
                            "fotos.Referenz5.jpg",
                    "fotos.Referenz6.jpg",
                            "fotos.Referenz7.jpg")
                          }

                  function select(i,newsrc) {
                  if (document.images)  {
                                    document.images[i].src = "../" + newsrc ;
                              }
                          }

                  function deselect(i,newsrc) {
                  if (document.images) {
                                    document.images[i].src = "../" + newsrc ;
                            }
                 }


                browserName = navigator.appName;

                browserVer = parseInt(navigator.appVersion);

                ns3up = (browserName == "Netscape" && browserVer >= 3);

                ie4up = (browserName.indexOf("Microsoft") >= 0 && browserVer >= 4);

                function doPic(imgName) {

                if (ns3up || ie4up) {

                imgOn = ("" + imgName);

                document.mainpic.src = imgOn;

                 }

           }