function checkBoxes(obj,formname,fieldname){
	if(document.forms[formname].elements[fieldname+"[]"].length) {
		for (i = 0; i < document.forms[formname].elements[fieldname+"[]"].length; i++){
			document.forms[formname].elements[fieldname+"[]"][i].checked = obj.checked;
			}
		}
	else {document.forms[formname].elements[fieldname+"[]"].checked = obj.checked;}
	}