Designing with JavaScript: Real-Time Forms Validation

<SCRIPT LANGUAGE = "JavaScript">

function checkForms(e) {
    if (e.target.name == "myname") {
        if (e.which >= 48 && e.which <= 57) {
        alert("Your name doesn't have any numbers.");
        return false;
        }
    }
    if (e.target.name == "myphone") {
        if ((e.which < 48 || e.which > 57) 
            && e.which != 32 && e.which != 45 && e.which != 8) {
        alert("Your phone number doesn\'t have any letters.");
        return false;
        }
    }
return true;
}
window.captureEvents(Event.KEYPRESS); 
window.onKeyPress = checkForms;

</SCRIPT>
<BODY>
<FORM NAME = "myform">
<INPUT TYPE = "TEXT" NAME = "myname"><BR>
<INPUT TYPE = "TEXT" NAME = "myphone"><BR>
<INPUT TYPE = "SUBMIT" VALUE = "Send Info">
</FORM>
</BODY>