// http://www.webreference.com/programming/css_content/index.html
function dsp(loc){
   if(document.getElementById){
      var foc=loc.firstChild;
      foc=loc.firstChild.innerHTML?
         loc.firstChild:
         loc.firstChild.nextSibling;
      foc.innerHTML=foc.innerHTML== '++' ? '--': '++';
      foc=loc.parentNode.nextSibling.style?
         loc.parentNode.nextSibling:
         loc.parentNode.nextSibling.nextSibling;
      foc.style.display=foc.style.display=='block'?'none':'block';
}}  

if (!document.getElementById)
   document.write('<style type="text/css"><!--\n'+'.dspcont{display:block;}\n'+'//--></style>');