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form validating help


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I wish to use either ajax or js or both to validate my php script.

now i am new to js & ajax so im curious if anyone can direct me to a good tutorial or some tips on this.

what I'm looking for?

-when an error occurs a message appears next to the form box

might want this to be ajax-based so that it can check this before anything processes.

i know ipb does something similar, so if someone knows how they do it, that'd help even more.

thank you in advance.
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Use javascript to valiate basic things,
like wether en email address is really an email address,
or if the number you products you want to order is an actual interger.

Use ajax to validate specific things,
like if your particular email address is in a database.

function validate()
var e = document.getElementById('thing').value;
if (e == '') {alert('dude, its blank');}
else if (isNaN(e)) {alert('dude, thats not a number');}
    else {alert('ok, looks good.')}

<input type="text" id="thing" name="thing">
<input type="button" onclick="validate();" value="check">
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