social media buttons in grey opaque

I have a website with grey opaque installed. the thing is when you click on the social media sharing buttons, it doesn’t open a contextual window for you to share the page without actually leaving the page. I’m not sure it’s elegant design or good usability. there’s a greater likelihood people will share more if they stay on the same page. here’s a sample code.
” id=”share_delicious” href=”http://del.icio.us/post?url=&lt;?php echo $var_sPermalink; ?>&title='<?php echo $var_sTitle; ?>’target=”>del.icio.us
any assistance will be appreciated. thanks