function setAll (det,viz) {
  for (props in document.all.chaptab.rows){
    if (props.substring(0,det.length) == det){
        document.all[props].style.display = viz;
    }
  }
}

function flip (det) {
  for (props in document.all.chaptab.rows){
    if (props.substring(0,det.length) == det){
      if (document.all[props].style.display == "block") {
        document.all[props].style.display="none";
      }else{
        document.all[props].style.display="block";
      }
    }
  }
}

<!-- fffffffffffffffffffffffffffffffffffff -->
function setAllm (det,viz) {
  for (props in document.all.chaptabm.rows){
    if (props.substring(0,det.length) == det){
        document.all[props].style.display = viz;
    }
  }
}

function flipm (det) {
  for (props in document.all.chaptabm.rows){
    if (props.substring(0,det.length) == det){
      if (document.all[props].style.display == "block") {
        document.all[props].style.display="none";
      }else{
        document.all[props].style.display="block";
      }
    }
  }
}
function nothing()
{
}