   node.attachEvent( "onmouseup", upHandler );

  } // endif

  WebBrowser.prototype.releaseMouseCapture = function( node, clickHandler, downHandler, moveHandler, upHandler ) {

   if( upHandler )
     node.detachEvent( "onmouseup", upHandler );
		 
   if( moveHandler )
     node.detachEvent( "onmousemove", moveHandler );
		 
   if( downHandler)
     node.detachEvent( "onmousedown", downHandler );
		 
   if( clickHandler)
     node.detachEvent( "onclick", clickHandler );
		 
     node.releaseCapture();

  }