<form id="form-id" name="form-name" method="post" action="save-post.php"); ?>">
<input id="text-field-id" name="post-text" type="text"
onkeydown="if (event.keyCode == 13) { this.form.submit(); return false; }">
<input id="input-id" type="submit" value="Save" name="input-name" />
</form>