How to display property text when hovering over d3 map

I am new to d3 and am trying to figure out how to get the ("NAME") property to appear when hovering over a polygon in a map. I know I should be doing something according to .on("mouseover", function(d,i) { some function that returns properties.NAME }

, but cannot figure out where to go from there. This is how js is written that statically puts a NAME property on each polygon:

        <script>

        var width = 950,
        height = 650;

        var projection = d3.geo.albers()
        .scale(120000)
        .center([22.85, 40.038]);

        var path = d3.geo.path()
        .projection(projection);

        var svg = d3.select("body").append("svg")
        .attr("width", width)
        .attr("height", height);

        d3.json("newnabes.json", function(error, topology) {
                var nabes = topojson.object(topology, topology.objects.temp);

                svg.selectAll("path")
                .data(nabes.geometries)
                .enter().append("path")
                .attr("d", path);

                svg.selectAll(".subunit-label")
                .data(nabes.geometries)
                .enter().append("text")
                .attr("class", function(d) { return "subunit-label " + d.id; })
                .attr("transform", function(d) { return "translate(" + path.centroid(d) + ")"; })
                .attr("dy", ".35em")
                .text(function(d) { return d.properties.NAME; });
            });

        </script>

      

        
        
        
      

    

Here is a small json snippet

{"type":"Topology",
  "transform":{
  "scale":[0.00003242681758896625,0.000024882264664420337],
  "translate":[-75.28010087738252,39.889167081829875]},
  "objects":{
    "temp":{
      "type":"GeometryCollection",
      "geometries":[{
         "type":"Polygon",
         "id":1,
         "arcs":[[0,1,2,3,4,5,6]],
         "properties":{"NAME":"Haddington"}
       },{
         "type":"Polygon",
         "id":2,
         "arcs":[[7,8,9,10,-3,11]],
         "properties":{"NAME":"Carroll Park"}
       }...

      

        
        
        
      

    

thank