Example code:

   // Browser portable event handler

   function myEventHandler(anEvent)

   {

      if(navigator.appName.indexOf("Microsoft") != -1)

      {

         anEvent = window.event;

         anEvent.srcElement = target;

         anEvent.button = which;

         anEvent.keyCode = which;

         anEvent.altKey = anEvent.modifiers & Event.ALT_MASK;

         anEvent.ctrlKey = anEvent.modifiers & Event.CONTROL_MASK;

         anEvent.shiftKey = anEvent.modifiers & Event.SHIFT_MASK;

         anEvent.clientX = pageX;

         anEvent.clientY = pageY;

      }

      // Portable event code goes here.

   }

Property attributes:

ReadOnly.

Refer to:

Window.event