Thank you for reporting.
WP-SimpleViewer uses a PHP method (split) which was deprecated in PHP v5.3.0.
This can be fixed by opening the 'wp-simpleviewer/wp-simpleviewer.php' file in a plain text editor and changing lines 450-452 from:

        $pro_options = split("\n", $custom_values['proOptions']);
        foreach ($pro_options as $pro_option) {
            $attrs = split('=', trim($pro_option));

... to:

        $pro_options = explode("\n", $custom_values['proOptions']);
        foreach ($pro_options as $pro_option) {
            $attrs = explode('=', trim($pro_option));

Then re-upload the file to its original location, overwriting the existing file.
This will be fixed in the next version of WP-SimpleViewer.

It seems that the same problem occurs on the juicebox WP-plugin.

Luckily, the same solution also works ;-)