function isUniqueEmail(email)
{
    var pars = "email="+email;
    var value;
    new Ajax.Request
    (
        '?subsection=emailcheck',
        {
            method:'post',
            asynchronous:false,
            parameters: pars,
            onComplete: function(resp){
            value = resp.responseText == 1 ? true : false;
            }
        }
    );

    return value;
}