Use jQuery .fadeIn()
Works wery good. Apply some .class to element, what you want to hide.
When you click on option, it will show or hide this element.
[jazzy form="2"]
<script type="text/javascript">
jQuery(document).ready(function(){
jQuery(".cvet").hide();
jQuery("#jzzf_2_sistema-1").click(function(){
jQuery(".cvet").hide();
jQuery(".cvet1").fadeIn("slow");
});
jQuery("#jzzf_2_sistema-2").click(function(){
jQuery(".cvet").hide();
jQuery(".cvet2").fadeIn("slow");
});
});
</script>
Sorry for my English. (