juse have a quick question, i have try to do the validation for email address. i need to do a validation such as validate if an email address is a school email(which means end with edu), but i decide to start from validate the normal email, the code below is what i have down.
Javascript part

```
function ok_Email(email){
    var filter = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
    if(filter.test(email)){
        return true;
        window.alert('This is an email')
    }
else{
    return false;
    window.alert('This is not an email')
}
}

```

Html part

```
<form name="myform"
onSubmit="return ok_Email(this);">
<p>
Please enter your email address: <br>
<input type="text" size=40 name="user_email">
<p>
<input type = submit value="Send">
</form>

```

The problem for this code is when i click the send buttom, the page did not change. As you see in the code, it should have an alert comes out but it doesn't. I think the problem comes from the buttom part but i am not sure.......