changed the math for calculating the time left in a lesson to be more compatible with browsers

mod/lesson/timer.js

@@ -25,7 +25,8 @@
     var mywidth = 80;
     var my12_hour = 1;
     var stopclock = 0;
-    
+    var myclock = '';
+	var timeleft, hours, minutes, secs;
     var javatimeDate = new Date();
     var javatime = javatimeDate.getTime();
     javatime = Math.floor(javatime/1000);
@@ -33,11 +34,16 @@
     difference = javatime - servertime;    
     starttime = starttime + difference;
 
-    var dn = ""; var old = "";
+    var dn = ""; 
+	var old = "";
 
-    if (document.all||document.getElementById) { document.write('<span id="LiveClockIE" style="width:'+mywidth+'px;"></span>'); }
-    else if (document.layers) { document.write('<ilayer id="ClockPosNS"><layer width="'+mywidth+'" id="LiveClockNS"></layer></ilayer>'); }
-    else { old = "true"; show_clock(); }
+    if (document.all||document.getElementById) { 
+		document.write('<span id="LiveClockIE" style="width:'+mywidth+'px;"></span>'); 
+	} else if (document.layers) { 
+		document.write('<ilayer id="ClockPosNS"><layer width="'+mywidth+'" id="LiveClockNS"></layer></ilayer>');
+	} else { 
+		old = "true"; show_clock();
+	}
     
     /*function leave() {  // feable attempt to run a script when someone leaves a timed test early, failed so far
         window.onunload = window.open('http://www.google.com','','toolbar=no,menubar=no,location=no,height=500,width=500');
@@ -63,10 +69,10 @@
             stopclock = 1;
         } else {
             timeleft = starttime + testlength - current;
-            dateobj = new Date(null, null, null, null, null, timeleft, null);
-            hours = dateobj.getHours();
-            minutes = dateobj.getMinutes();
-            secs = dateobj.getSeconds();
+			hours = Math.floor(timeleft/3600);
+			timeleft = timeleft - (hours * 3600);
+			minutes = Math.floor(timeleft/60);
+			secs = timeleft - (minutes * 60);           
             
             if (secs < 10) {
                 secs = "0"+secs;