Prompt ALO EasyMail in a dialog: put this php into /wp-content/mu-plugins

alo_easymail_dialog.php

<?php

/*
// -------------------------------------------------------------------------------
// EXTRA: add the "open-easymail-popup" class to have a link that opens newsletter dialog
// -------------------------------------------------------------------------------
<a href="" class="open-easymail-popup">Newsletter</a>
*/


function alo_easymail_dialog_enqueue_scripts() {

		global $wp_scripts;
		
        wp_enqueue_script( 'jquery' );
        wp_enqueue_script( 'jquery-ui-core');
		wp_enqueue_script ( 'jquery-ui-dialog' );
		wp_enqueue_script ( 'jquery-ui-resizable' );
		wp_enqueue_script ( 'jquery-ui-draggable' );
	 
		$queryui = $wp_scripts->query('jquery-ui-core');

		// Choose a theme: http://jqueryui.com/themeroller/
		$ui_theme = 'blitzer';
		
		$url = "http://ajax.googleapis.com/ajax/libs/jqueryui/".$queryui->ver."/themes/".$ui_theme."/jquery-ui.css";
		wp_enqueue_style('jquery-ui-'.$ui_theme, $url, false, null);
				
}
add_action( 'wp_enqueue_scripts', 'alo_easymail_dialog_enqueue_scripts' );


function alo_easymail_dialog_footer_scripts() {
		global $alo_easymail_dialog_hide;

		if ( $alo_easymail_dialog_hide ) return;
?>
<script type="text/javascript">
jQuery(document).ready(function($) {
	if ( $('.widget.alo_easymail_widget' ).length > 0 )
	{
		$('.widget.alo_easymail_widget' ).dialog({
			title: "<?php esc_html_e( 'Newsletter', "alo-easymail")?>",
			autoOpen: true,
			zIndex: 999999,
			modal: true
		});
		
		$('.open-easymail-popup').click( function(e) {
			e.preventDefault();
			$( ".widget.alo_easymail_widget" ).dialog( "open" );
		});		
	}
});
</script>

<style type="text/css">
	/* Input del form newsletter */
	.alo_easymail_form_table input {
		color: #000000;
		background-color: #eeeeee;
	}
</style>
<?php
}
add_action( 'wp_footer', 'alo_easymail_dialog_footer_scripts' );



/**
* Set cookie
*/
function alo_easymail_dialog_set_cookie () {
	global $alo_easymail_dialog_hide;
	$alo_easymail_dialog_hide = true;

    $alo_dialog_cookie = "alo_bh_hide_popup";
	if ( !isset($_COOKIE[ $alo_dialog_cookie ]) ) {

		// Set a cookie to hide the newsletter untill tomorrow
		setcookie ( $alo_dialog_cookie, "hide", time()+(60*60*24*1));
		
		$alo_easymail_dialog_hide = false;
	}
}

add_action('init', 'alo_easymail_dialog_set_cookie' );