function SetAllCheckBoxes(form, boxNames, value)
{
	if(!document.forms[form])
		return;
	var checkBoxes = document.forms[form].elements[boxNames];
	if(!checkBoxes)
		return;
	var countCheckBoxes = checkBoxes.length;
	if(!countCheckBoxes)
		checkBoxes.checked = value;
	else
		for(var i = 0; i < countCheckBoxes; i++)
			checkBoxes[i].checked = value;
}