Fix a series of small bugs

Signed-off-by: Eduardo L. Buratti <elb09@c3sl.ufpr.br>

web/app/models/NetUsage.java

@@ -45,9 +45,9 @@ public class NetUsage implements java.io.Serializable {
         try {
             PreparedStatement st = conn.prepareStatement(
                     "SELECT (dat_id + collect_time - interval '00:02:30'), " +
-                    " sum(down_kbits)/1024/300*8::bigint, sum(up_kbits)/1024/300*8::bigint " +
+                    " (sum(down_kbits)/300)::bigint, (sum(up_kbits)/300)::bigint " +
                     "FROM fact_net_usage " +
-                    "WHERE sch_id=? " +
+                    "WHERE sch_id=? AND dat_id > (current_date - interval '6 months') " +
                     "GROUP BY sch_id, dat_id, collect_time " +
                     "ORDER BY dat_id, collect_time ASC;");
             st.setLong(1, id);

web/public/charts/network.js

@@ -64,6 +64,7 @@ Charts.load = function(project, region, state, city) {
             tempInput.value = category;
 
             tempForm.appendChild(tempInput);
+            document.body.appendChild(tempForm);
         	tempForm.submit();
         };
     }

web/public/javascripts/school.js

@@ -138,6 +138,10 @@ $.fn.loadContent = function() {
                         legend: {
                             enabled: true
                         },
+                        tooltip: {
+                            shared: true,
+                            pointFormat: '<span style="color:{series.color}">{series.name}</span>: <b>{point.y} Kbps</b><br/>'
+                        }, 
                         series : [{
                             name : 'Download',
                             data : data.download,