different infowindow with each polygon

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Javascript

Google-Maps

Sorry for my English.
I have already read this post , but I can't understand how to do the same in my case. I'm new in Javascript and it is my first job.

function addpolygon(n11,n12,n21,n22,n31,n32,n41,n42,n51,n52,info){
     var Coords = [
     new google.maps.LatLng(n11,n12),
     new google.maps.LatLng(n21,n22),
     new google.maps.LatLng(n31,n32)];
     if (n41 != "" && n42 != "") { 
     Coords.push(new google.maps.LatLng(n41,n42))}
     if (n51 != "" && n52 != "") {
     Coords.push(new google.maps.LatLng(n51,n52))}
          
     NewPolygon = new google.maps.Polygon({
     paths: Coords,
     strokeColor: "#FF0000",
     strokeOpacity: 0.8,
     strokeWeight: 2,
     fillColor: "#FF0000",
     fillOpacity: 0.35
     });
     
     NewPolygon.setMap(map);
     
     polygonsArray.push(NewPolygon);
     
     // Add a listener for the click event
     google.maps.event.addListener(NewPolygon, 'rightclick', showInfo);

     infowindow = new google.maps.InfoWindow();
     infowindow.setContent(info);
   }

function showInfo(event){
    infowindow.setPosition(event.latLng);
   	infowindow.open(map);
   }

function deletePolygons() { 
    if (polygonsArray) {
    for (j in polygonsArray) {
      polygonsArray[j].setMap(null);
      }
    polygonsArray.length = 0;
    }
   }

I call function "addpolygon" every time when want to create new polygon with some coords and different info. I push polygons in array to delete them in future. What I must to do if I want to show info's with each polygon?