Need to popup a window showing php form

Written by memory, not tested, but can be used as basic draft (if this is what you ask about):

<style>
.popup {
	display: none;
	/* some other styles */
}
</style>
<a href="#" data-popup="#my-popup">Show form</a>

<div class="popup" id="my-popup">
{control popupForm}
</div>

<script>
$("[data-popup]").on("click", function (e) {
	e.preventDefault();
	$($(this).data("popup")).show();
});
</script>