// JavaScript Document
var refer=true;
function combo(aa, bb, cc, dd, ee) 
{
if (refer) {
 document.getElementById(aa).style.display='';
 document.getElementById(bb).src='images/minus.gif';
 document.getElementById(cc).className='top1';
 document.getElementById(dd).className='bot1';
 document.getElementById(ee).className='mid1';
 refer=false;
}
else {
  document.getElementById(aa).style.display='none';
  document.getElementById(bb).src='images/plus.gif';
  document.getElementById(cc).className='top';
  document.getElementById(dd).className='bot';
  document.getElementById(ee).className='mid';
  refer=true;
}
}