function help_show(obj, str, w)
{
 var x = obj.offsetLeft + obj.offsetWidth/2 + 10, 
	 y = obj.offsetTop + obj.offsetHeight/2 + 10;

 while(obj = obj.offsetParent)
 {
  x += obj.offsetLeft;
  y += obj.offsetTop;
 }
 
 hide = document.getElementById('help_box');
 hide.innerHTML = str;
 hide.style.width = w;
 hide.style.left = x;
 hide.style.top = y;
 hide.style.display = '';
}

function help_hide()
{
 document.getElementById('help_box').style.display = 'none';
}