Alerts not working

Question

Possible Duplicate:
Post Method Not giving Alerts like planned?

Javascript:

function isAlphanumeric(elem, helperMsg){
    var alphaExp = /^[0-9a-zA-Z]+$/;
    if(elem.value.match(alphaExp)){
        return true;
    } else {
        alert(helperMsg);
        elem.focus();
        return false;
    }
}

function isGoodPhrase(elem,helperMsg){
    var badPhrase=/EPW|ESW|\s/;
    if (elem.value.match(badPhrase)){
        alert(helperMsg);
        elem.focus();
        return false;
    } else {
        return true;
    }
}

function checkInput(id)    {
    return isAlphanumeric(document.getElementById(id),'Your Submission Contained Invalid Characters')
        && isGoodPhrase(document.getElementById(id), 'Please Enter A Correct Friend Code!');
    }

    </script>

And HTML

    <form action="" method="post">
    <div align="center"><legend>Add a Code</legend>
    <label for="code"></label>
    <input type="text" name="code" id="code" maxlength="10" />
    <input type='button' onclick="return checkInput('code');" value='Check Field' />
    </form>
    </div>

Answer 1

alerts are working normally, i tested them.

Seams that the problem that you are testing with the right values that does not match the regex to see the alerts