function getPosition(obj)  //not tested !!!
{
  var left=0,top=0;
  while(obj)
       {
	     left+=obj.offsetLeft-obj.scrollLeft;
         top+=obj.offsetTop-obj.scrollTop;
        if(obj.style.borderTopWidth!='')
          top+=parseInt(obj.style.borderTopWidth);
        if(obj.style.borderLeftWidth!='')
          left+=parseInt(obj.style.borderLeftWidth);
        obj=obj.offsetParent;
	   }
  return {left:left,top:top};
}

function findPosY(obj)
{
    var curtop = 0;
    while (obj)
    {
        curtop += obj.offsetTop;
        obj = obj.offsetParent;
    }
    return curtop;
}

function findPosX(obj)
{
    var curleft = 0;
    while (obj)
    {
        curleft += obj.offsetLeft;
        obj = obj.offsetParent;
    }
    return curleft;
}

function hide(div_id)
{
 d = document.getElementById(div_id);
 d.style.display='none';
}

function show(div_id)
{
 d = document.getElementById(div_id);
 d.style.display='';

 parent_id = 'td' + div_id;
 p = document.getElementById(parent_id);

 base_x= findPosX(p);
 base_y= findPosY(p);
 p_height = p.offsetHeight;
 p_width = p.offsetWidth;


if(div_id.length == 4)
  {
   d.style.left = base_x ;
   d.style.top =  base_y + p_height ;
  }

if(div_id.length > 4)
  {
   d.style.left = base_x + p_width;
   d.style.top =  base_y;
  }
 txt1 = document.getElementById('h'+div_id.length);
 txt2 = document.getElementById('h'+(2+div_id.length));
 txt3 = document.getElementById('h'+(4+div_id.length));
 txt4 = document.getElementById('h'+(6+div_id.length));

  if(txt1.value != div_id)
     {
      if(txt1.value!='0')   hide(txt1.value);
      if(txt2.value!='0')   hide(txt2.value);
      if(txt3.value!='0')   hide(txt3.value);
      if(txt4.value!='0')   hide(txt4.value);

      txt1.value = div_id;
     }

}
function hideall()
{
 txt1 = document.getElementById('h2');
 txt2 = document.getElementById('h4');
 txt3 = document.getElementById('h6');
 txt4 = document.getElementById('h8');
	  if(txt1.value!='0') hide(txt1.value);
      if(txt2.value!='0') hide(txt2.value);
      if(txt3.value!='0') hide(txt3.value);
      if(txt4.value!='0') hide(txt4.value);

}