function show_warning()
{
 wobj=document.getElementById('warning_box');
 wobj.style.display='block'; //you'd prefer to do this at the end hugh? well clientWidth=0 while display=none!
 var dw=parseInt(wobj.clientWidth);
 var dh=parseInt(wobj.clientHeight);
 wobj.style.left=300+'px';
 wobj.style.top=100+'px';
 document.getElementById('uw_closebox').style.display='block';
 document.getElementById('uw_closelink').style.display='block';
}

function hide_warning()
{
  document.getElementById('warning_box').style.display='none';
  document.getElementById('uw_closebox').style.display='none';
  document.getElementById('uw_closelink').style.display='none';
}