woot woot, it works! THANK YOU for your help!

final snippet of code with Radina's help:
 downloadUrl("genxml-buildings-depts.xml", function(data) {
        var xml = data.responseXML;
       var markers = xml.documentElement.getElementsByTagName("building");
        for (var i = 0; i < markers.length; i++) {
          //get building        
          var building_name = markers[i].getAttribute("building_name");
          var building_type = markers[i].getAttribute("building_type");
          var point = new google.maps.LatLng(
              parseFloat(markers[i].getAttribute("building_infoLat")),
              parseFloat(markers[i].getAttribute("building_infoLng")));
          var building_code = markers[i].getAttribute("building_code");
          //get department    
             var deptName = null;
             if (markers[i].hasChildNodes())
            {
            deptName = markers[i].childNodes[1].textContent;
             var html = "<b>" + building_name + "</b> <br/>" + building_code 
+ "</b> <br/> <b>Departments</b><br />" + deptName;
            }
             else
            {
             var html = "<b>" + building_name + "</b> <br/>" + building_code 
+ "</b> <br/> <b>No Departments</b><br />" + deptName;
            }
          //create info box text
          var icon = customIcons[building_type] || {};
          var marker = new google.maps.Marker({
            map: map,
            position: point,
            icon: icon.icon,
            shadow: icon.shadow
          });
          bindInfoWindow(marker, map, infoWindow, html);
        }

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