//------------------------------------------------------------
NS4 = (document.layers) ? true : false;
NS6 = (navigator.userAgent.indexOf( "Netscape" ) >= 0) ? true : false;
NS  = (NS4 || NS6)
IE = (navigator.userAgent.indexOf( "MSIE " ) >= 0) ? true : false;

timerID = null;
offsetX = 0;
offsetY = 0;
previousY = -20;
previousX = 0;

pDeltaY = 0;
pDeltaX = 0;
//------------------------------------------------------------
function tick() {
    var offX = (NS) ? window.pageXOffset : document.body.scrollLeft; 
    var offY = (NS) ? window.pageYOffset : document.body.scrollTop;
    offX += offsetX;
    offY += offsetY;

    var delta;

    if (offY != previousY) {
        delta = .08 * (offY - previousY);
        if (delta > 0) { delta = Math.ceil(delta);  }
        else           { delta = Math.floor(delta); }
	pDeltaY += delta;
        if (NS4){ document.slider.top += delta; }
  	if (NS6){ document.getElementById("slider").style.top = pDeltaY; } 
        if (IE) { document.all.slider.style.pixelTop += delta; }
        previousY = previousY + delta;
    }
    if (offX != previousX) {
        delta = .2 * (offX - previousX);
        if (delta > 0) 	{ delta = Math.ceil(delta);  }
        else 		{ delta = Math.floor(delta); }
	pDeltaX += delta;
        if (NS4) { document.slider.left += delta; }
	if (NS6){ document.getElementById("slider").style.left = pDeltaX; } 
        if (IE) { document.all.slider.style.pixelLeft += delta; }
        previousX = previousX + delta;
    }
}
//------------------------------------------------------------
function ladyToFly(ox,oy) {
  if ( (IE) || (NS) ) {
    timerID = setInterval("tick()",1);
    offsetX = ox;
    offsetY = oy;	
  }
}
//------------------------------------------------------------
function landingGear() {
  if ( (IE) || (NS) ) {
    clearInterval(timerID);
  }
}