function doSection (secNum){
//display the section if it's not displayed; hide it if it is displayed
if ( document.getElementById(secNum + "_1").style.display=="none")
{
  document.getElementById(secNum + "_1").style.display=""
  document.getElementById(secNum + "_2").src='../images/downarrow.gif'
} else { 
  document.getElementById(secNum + "_1").style.display="none"
  document.getElementById(secNum + "_2").src='../images/leftarrow.gif'
}
}