function toggleCheckbox(formName, obj) {
var form = document.getElementById(formName);
	for(i = 0; i < form.elements.length; i++) {
		if(form.elements[i].type == 'checkbox') {
			form.elements[i].checked = obj.checked;
		}
	}
}

function toggleMain(formName, chkBoxName) {
var form = document.getElementById(formName);
var checked = true;
	for(i = 0; i < form.elements.length; i++) {
	var el = form.elements[i];
		if(el.type == 'checkbox' && el.name != chkBoxName) {
			if(el.checked == false) {
				checked = false;
				break;
			}
		}
	}
	form.elements[chkBoxName].checked = checked;
}

function hasItemsToDelete(formName) {
var form = document.getElementById(formName);
var checked = false;
	for(i = 0; i < form.elements.length; i++) {
	var el = form.elements[i];
		if(el.type == 'checkbox') {
			if(el.checked == true) {
				checked = true;
				break;
			}
		}
	}
	return checked;
}