function nrcIE()
{
  if (document.all)
  {
    return false;
  }
}
function nrcNS(e)
{
  if(document.layers||(document.getElementById&&!document.all))
  { 
    if (e.which==2||e.which==3)
    {
	  return false;
	}
  }
} 

if (document.layers)
{
  document.captureEvents(Event.MOUSEDOWN);
  document.onmousedown=nrcNS;
}
else
{
  document.onmouseup=nrcNS;document.oncontextmenu=nrcIE;
}
document.oncontextmenu=new Function("return false");