Back btn for iframe

<iframe name="codeframe" src="http://FILEURL" style="width:100%; height:60%; background:#fff;"></iframe>
<a href="#" onClick="codeframe.history.go(-1);">back</a>

Control Iframe style

<script type="text/javascript">

if(top.location.href == 'http://www.skwebo.com/create-event/'){
document.write('<style type="text/css">html{background-color:transparent;}#adminmenu,#contextual-help-link-wrap,#wphead,#wp-admin-bar{display:none;}</style>');
}

</script>

Refresh parent of an iframe

<script type
="text/javascript">

function refreshParent(){
parent.location.reload();
}
</script>

<input type="button" value="Refresh" onClick="refreshParent()" title="Refresh My Parent"/>