<script type="text/javascript">
	window.onload = function() {
		// get partner_key from cookie and marketo form
		var partner_key = growsumo.data.partner_key;
		var marketo_form = MktoForms2.allForms()[0];
		// push partner_key to a hidden field on the form
		marketo_form.addHiddenFields({
			"PartnerKey__c": partner_key
		});
	}
</script>