function check_all(idname,field) {
	for(i=0;i < document.getElementById(idname).elements[field].length;i++) {
		document.getElementById(idname).elements[field][i].checked = true;
	}
	if(!document.getElementById(idname).elements[field].length) {
		document.getElementById(idname).elements[field].checked = true;
	}
}

function uncheck_all(idname,field) {
	for(i=0;i < document.getElementById(idname).elements[field].length;i++) {
		document.getElementById(idname).elements[field][i].checked = false;
	}
	if(!document.getElementById(idname).elements[field].length) {
		document.getElementById(idname).elements[field].checked = false;
	}
}

function setFocus(field) {
	document.getElementById(field).focus();
}