NS4 = (document.layers) ? 1 : 0;
IE4 = (document.all) ? 1 : 0;

function show(name) {
  x = currentX-100;
  y = currentY+850;
  if (NS4) {
    document.layers[name].xpos = parseInt ( x );
    document.layers[name].left = parseInt ( x );
    document.layers[name].ypos = parseInt ( y );
    document.layers[name].top = parseInt ( y );
    document.layers[name].visibility = "show";
  } else {
    document.all[name].style.left = parseInt ( x );
    document.all[name].style.top = parseInt ( y );
    document.all[name].style.visibility = "visible";
  }
}
    
function hide(name) {
  if (NS4) {
    document.layers[name].visibility = "hide";
  } else {
    document.all[name].style.visibility = "hidden";
  }
}
    
currentX = currentY = 0;

function grabEl(e) {
  if ( NS4 ) {
    currentX = e.pageX;
    currentY = e.pageY;
  } else {
    currentX = event.x;
    currentY = event.y;
  }
}
    
if ( NS4 ) {
  document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE);
}
document.onmousemove = grabEl;