Bring GoogleMaps InfoWindow to front

I have a GoogleMaps APIv3 application in which multiple InfoWindows can be open at any one time. I would like to be able to bring an obscured InfoWindow to the front of all other InfoWindows if any part of it is clicked - similar to the behaviour of windows in MS Windows OS.

I had thought to add an onclick event handler which increases the z-index of the InfoWindow, but the event handler does not appear to be firing. ZIndex is a global variable that keeps increasing as InfoWindows are clicked - or thats the theory anyway.

Can anyone help ? Here is my code:-

var ZIndex=1;
var iw = new google.maps.InfoWindow({ content:contentString });
google.maps.event.addListener(iw, 'click', handleInfoWindowClick(iw) );

function handleInfoWindowClick(infoWindow) {
   return function() {
      infoWindow.setZIndex(ZIndex++);
   }
}

there is no click-event for an infoWindow, it's a little bit more difficult.

1. you'll need to use an element(not a string) as content for the infowindow, because you need a DOMListener instead a listener for the infowindow-object
2. when domready-fires, you must apply the click-DOMListener to the anchestor of this content-node that defines the infowindow

The following code will do this for you, add this to your page:

google.maps.InfoWindowZ=function(opts){
          var GM = google.maps,
              GE = GM.event,
              iw = new GM.InfoWindow(),
              ce;

             if(!GM.InfoWindowZZ){
                GM.InfoWindowZZ=Number(GM.Marker.MAX_ZINDEX);
             }

             GE.addListener(iw,'content_changed',function(){
               if(typeof this.getContent()=='string'){
                  var n=document.createElement('div');
                      n.innerHTML=this.getContent();
                      this.setContent(n);
                      return;
               }
               GE.addListener(this,'domready',
                               function(){
                                var _this=this;
                                _this.setZIndex(++GM.InfoWindowZZ);
                                if(ce){
                                  GM.event.removeListener(ce);
                                }
                                ce=GE.addDomListener(this.getContent().parentNode
                                                  .parentNode.parentNode,'click',
                                                  function(){
                                                  _this.setZIndex(++GM.InfoWindowZZ);
                                });
                              })
             });

             if(opts)iw.setOptions(opts);
             return iw;
        }

Instead of google.maps.InfoWindow() you must call now google.maps.InfoWindowZ()

It also returns a genuine InfoWindow, but with the mentioned listener applied to it. It also creates the node from the content when needed.

Demo: http://jsfiddle.net/doktormolle/tRwnE/

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Updated version for visualRefresh(using mouseover instead of click) http://jsfiddle.net/doktormolle/uuLBb/