function checkqsodata()
{
    var error = 'Ok';
    var data;
    
    // Test if its a valid call
    data = document.qso.call.value;
    var exp = /^([0-9]?[a-zA-Z]{1,2}[0-9]{0,4}[\/-])?[0-9]?[a-zA-Z]{1,2}[0-9]{1,4}[a-zA-Z]{1,7}([\/-][a-zA-Z0-9]+){0,2}$/;
    if (!exp.exec(data))
    {
        error = 'This call doesn\'t seem to be valid';
    }

    if (error == 'Ok')
        return true;
    else
    {
        alert(error);
        return false;
    }
}