// events.js
var x1,y1;
function enableEffects(ev) {
 if(document.layers) {
  x1 = ev.screenX;
  y1 = ev.screenY;
  document.captureEvents(Event.MOUSEMOVE);
 }
 else {
  x1 = event.screenX;
  y1 = event.screenY;
 }
}