function contr_md5(val, val2)
{
    var str = val.value.toUpperCase();
    str = hex_md5(str);
    if (str==val2.value) return 1;
    else return 0;
}

function isValidEmail(str) {
    var email_reg_exp = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-]{2,})+\.)+([a-zA-Z0-9]{2,})+$/;
    
    if (!email_reg_exp.test(str) || (str == "") || (str == "undefined")) return false;
    else return true;
}