function checkUncheck(oImg, sChkId){
  var oChk = document.getElementById(sChkId);
  oChk.checked = !oChk.checked;
  oImg.src = (oChk.checked) ? "/images/checkbox-on.gif" : "/images/checkbox-off.gif";
}
function checkUncheck_white(oImg, sChkId){
  var oChk = document.getElementById(sChkId);
  oChk.checked = !oChk.checked;
  oImg.src = (oChk.checked) ? "/images/checkbox-on-white.gif" : "/images/checkbox-off-white.gif";
}