input type=submit not validating

HTML5 and jQuery with jQuery Mobile. I want to use a button to submit a form so that an image can be included in it.

The form needs to be validated, too.

With the following, the form submits but is not validated. That is, if I leave a required form element blank, the form will submit (the alert box shows up).

Any help is appreciated. Thanks!

<form id="myform" name="myform">

    [required elements here to validate]

    <button type="button" name="submit1" id="submit1"><img src="myimg" />Submit</button>
</form>

....

jQ('#submit1').click(function(event){
    jQ('#myform').submit(event);
    event.preventDefault();

    [more code here to run]

    alert('submitted');
});