//if (document.layers) document.captureEvents(Event.mousemove);
document.ondblclick = m_down;

function m_down(event0){
  if (navigator.appName.charAt(0)=="M") {
    Et =event.type;
    Sx =event.screenX;
    Sy =event.screenY;
    Wx = document.body.scrollLeft+event.clientX;
    Wy = document.body.scrollTop+event.clientY;
  }
  if (navigator.appName.charAt(0) == "N") {
    Et =event0.type;
    Sx =event0.screenX;
    Sy =event0.screenY;
    Wx =event0.pageX;
    Wy =event0.pageY;
  }
  txt0="";
  txt0+="マウスの座標";
  txt0+=" : X = "+Wx;
  txt0+=" : Y = "+Wy;
  if (navigator.appName.charAt(0)=="M") {
    document.all["span1"].style.visibility = 'visible';
    document.all["span1"].style.left = Wx;
    document.all["span1"].style.top = Wy-6;
  }
  if (navigator.appName.charAt(0) == "N") {
    document.layers['span1'].style.visibility = 'visible';
    document.layers['span1'].x = Wx;
    document.layers['span1'].y = Wy-6;
    document.layers['span1'].bgColor = "white";
  }

  document.form1.xbox.value = Wx;
  document.form1.ybox.value = Wy;

  alert(Et+"の発生"+"\n"
  +"Screen x = "+Sx+"\n"
  +"Screen y = "+Sy+"\n"
  +"Window x = "+Wx+"\n"
  +"Window y = "+Wy+"\n"
  );
  return true;
}