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Stop accidentally subtracting onscreen_canvas.offset{Left,Top} from
the return value of relative_mouse_coords! I only got away with that
error because the canvas was at offset zero compared to its immediate
parent element.

[originally from svn r9808]

--- a/emccpre.js

+++ b/emccpre.js

@@ -135,9 +135,7 @@

     buttons_down = 0;

     onscreen_canvas.onmousedown = function(event) {

         var xy = relative_mouse_coords(event, onscreen_canvas);

-        mousedown(xy.x - onscreen_canvas.offsetLeft,

-                  xy.y - onscreen_canvas.offsetTop,

-                  event.button);

+        mousedown(xy.x, xy.y, event.button);

         buttons_down |= 1 << event.button;

         onscreen_canvas.setCapture(true);

     };

@@ -146,9 +144,7 @@

     onscreen_canvas.onmousemove = function(event) {

         if (buttons_down) {

             var xy = relative_mouse_coords(event, onscreen_canvas);

-            mousemove(xy.x - onscreen_canvas.offsetLeft,

-                      xy.y - onscreen_canvas.offsetTop,

-                      buttons_down);

+            mousemove(xy.x, xy.y, buttons_down);

         }

     };

     mouseup = Module.cwrap('mouseup', 'void',

@@ -157,9 +153,7 @@

         if (buttons_down & (1 << event.button)) {

             buttons_down ^= 1 << event.button;

             var xy = relative_mouse_coords(event, onscreen_canvas);

-            mouseup(xy.x - onscreen_canvas.offsetLeft,

-                    xy.y - onscreen_canvas.offsetTop,

-                    event.button);

+            mouseup(xy.x, xy.y, event.button);

         }

     };