Stylesheet switcher

Hello,

I managed to add stylesheet theme options for my new theme, like this:

<select name="<?php echo $value['id']; ?>" id="<?php echo $value['id']; ?>">
<?php foreach ($value['options'] as $option) { ?>
<option<?php if ( get_settings( $value['id'] ) == $option) { echo ' selected="selected"'; } elseif ($option == $value['std']) { echo ' selected="selected"'; } ?>><?php echo $option; ?></option>
<?php } ?>
</select>

Everything works fine inside the theme options page. But how can I add a theme switcher on the sidebar of the website, so users can select and change stylesheets for previewing purposes?

This menu works well on the website too, but I don’t know how to save the selected options and make the loaded stylesheet change.

Any ideas? Is it possible?
Thank you!