TRY THIS:

<iframe allowtransparency="true" src="http://www.jotform.com/form/73553351213" frameborder="0" style="width:100%; height:740px; border:none;" scrolling="no" /iframe>

OR THIS:

<iframe allowtransparency="true" src="http://form.jotform.com/form/73553351213" frameborder="0" style="width:100%; height:740px; border:none;" scrolling="no" /iframe>