function trim(value){
	i = 0;
	while(value.charCodeAt(0) == '32'){
		value = value.substring(i,value.length);
		i++;
	}
	while(value.charCodeAt(value.length-1) == "32"){
		value = value.substring(0,value.length-1);
	}
	return value;
}

function valida_radios(obj_campo){
	for (i=0;i<obj_campo.length;i++) {
		if (obj_campo[i].checked == true) {
			return true;
		}
	}
	return false;
}

function validaCancelamentoForm() {
	me = document.cancelamento_form;
	if (!validaEmail(me.email.value)) {
		alert('E-mail inválido');
		me.email.focus();
		return false;
	}
	return true;
}

function validaEmail(email) {
	var reg_email = /^[a-z0-9_.-]+@([a-z0-9_]+\.)+[a-z]{2,4}$/i;
	return reg_email.test(email);
}