function expand(theTable,theImg)
{
if (document.getElementById(theTable).style.display == 'none')
   {
   document.getElementById(theTable).style.display = 'block';
   document.getElementById(theImg).src='images/onButton.gif';
   }
   else
   {
   document.getElementById(theTable).style.display = 'none';
      document.getElementById(theImg).src='images/offButton.gif';

   }
}

function expand_em(theTable,theImg)
{
if (document.getElementById(theTable).style.display == 'none')
   {
   document.getElementById(theTable).style.display = 'block';
   document.getElementById(theImg).src='images/onButton_em.gif';
   }
   else
   {
   document.getElementById(theTable).style.display = 'none';
      document.getElementById(theImg).src='images/offButton_em.gif';

   }
}

function expand_pre(theTable,theImg)
{
if (document.getElementById(theTable).style.display == 'none')
   {
   document.getElementById(theTable).style.display = 'block';
   document.getElementById(theImg).src='images/onButton_pre.gif';
   }
   else
   {
   document.getElementById(theTable).style.display = 'none';
      document.getElementById(theImg).src='images/offButton_pre.gif';

   }
}