function checkAll(field)
{
	var countCheckBoxes = field.length;
	if(!countCheckBoxes)
		field.checked = true;
	else
		// set the check value for all check boxes
		for (i = 0; i < field.length; i++)
			field[i].checked = true ;
}

function uncheckAll(field)
{
	var countCheckBoxes = field.length;
	if(!countCheckBoxes)
		field.checked = false;
	else
		// set the check value for all check boxes
		for (i = 0; i < field.length; i++)
			field[i].checked = false;
}


function setAllCbs(mode) {
var form = document.WERTE;
  for(var i=0;i<20;i++) {
    if(typeof(form.cbMark[i]) == 'object') {
      form.cbMark[i].checked = mode;
    }
  }
}