clicEnCours = false;
position_x = 0;
position_y = 0;
netscape = false; 
if (navigator.appName.substring(0,8) == "Netscape")
  { 
  netscape = true;
  } 

function boutonPresse() 
  {
  origine_x = x - position_x;
  origine_y = y - position_y;
  clicEnCours = true;
  }

function boutonRelache()
  {
  clicEnCours = false;
  }

function deplacementSouris(e)
  {
  x = (netscape) ? e.pageX : event.x + document.body.scrollLeft;
  y = (netscape) ? e.pageY : event.y + document.body.scrollTop;

  if (clicEnCours && document.getElementById)
    {
    position_x = x - origine_x;
    position_y = y - origine_y;
    document.getElementById("menu").style.left = position_x
    document.getElementById("menu").style.top = position_y
    }
  }

if (netscape)
  {
  document.captureEvents(Event.MOUSEMOVE);
  }

document.onmousemove = deplacementSouris;