<script>
( function( $ ) {
    $( document ).ready( function() {
        var bloomSubmit = $( " .et_bloom_submit_subscription" );
        bloomSubmit.click( function() {
            var FormField = $( '.et_bloom_popup_input input' );
            FormField.each( function() {
                if ( $( this ).attr( 'value' ) == '' ) {
                    $( this ).addClass( 'et_bloom_warn_field' );
                } else {
                    $( this ).removeClass( 'et_bloom_warn_field' );
                }
            } )
        } )
    } );
} )( jQuery );
</script>