function check_voting(formName) {

	var answer = document.forms[formName].elements["answer[]"];
	var checked = false;
	for (i = 0; i < answer.length; i++) {
		if (answer[i].checked) {
			checked = true;
			break;
		}
    } 

	if (checked) {
		return true;
	}
	else {
		alert("Debe elegir una respuesta");
		return false;
	}
}

function send_reset_combo(formName, fieldName) {

	form = document.forms[formName];
	form.elements[fieldName].selectedIndex = 0;

	form.submit();
}

function check_form(formName, fieldValor, fieldOpinion, fieldPrecio) {
	form = document.forms[formName];
	if (form.elements[fieldValor].selectedIndex == 0){
		alert("Debe seleccionar un valor");
		return false;
	} else if (form.elements[fieldOpinion].selectedIndex == 0){
		alert("Debe seleccionar una opinion");
		return false;	
	} else if (form.elements[fieldPrecio].value == '') {
		alert("Introduzca el precio");
		form.elements[fieldPrecio].focus();
		return false;
	}	else {
			precio = form.elements[fieldPrecio].value;
			precio = precio.replace(",",".");
			if (isNaN(precio)){
				alert("Introduzca un precio valido");
				form.elements[fieldPrecio].focus();
				return false;
			} else {
				form.elements[fieldPrecio].value = precio;
				return true;
			}
		}
}

function com_analisis_buscar(formName, selectName) {

	form = document.forms[formName];
	if (form.elements[selectName].selectedIndex == 0) {
		alert("Debe seleccionar un valor")		;
		return false;;
	}
	else {
		form.submit();
	}
}