function checkallornone(id_form) {

	for (var i=0;i<document.forms[id_form].elements.length;i++) {
		if(document.forms[id_form].elements[i].type=='checkbox') {
			if(document.forms[id_form].elements[i].name!='allnone') {
				document.forms[id_form].elements[i].checked = document.forms[id_form].elements['allnone'].checked;
			}
		}
	}
	
}