[Plugin: WP Social Toolbar] W3 Validation Errors for No "alt attribute on images

FYI: Plugin is working fine no problems at all with functionality, just validation errors.

Below are the error I got for my site http://www.valpocreative.com/web-designer/ (I am posting URL in case this has to do with theme settings or something of that nature)

The Errors:

Line 6320, column 148: required attribute “alt” not specified
…gins/wp-social-toolbar/images/icons/white/show.png” class=”wpsc_show_button” />
Line 6327, column 160: required attribute “alt” not specified
…ns/wp-social-toolbar/images/icons/white/close.png” class=”wpsc_close_button” />
Line 6334, column 202: required attribute “alt” not specified
…m/wp-content/plugins/wp-social-toolbar/images/gray/rss.png” />
Line 6336, column 193: required attribute “alt” not specified
…/wp-content/plugins/wp-social-toolbar/images/gray/twitter.png” />
Line 6337, column 211: required attribute “alt” not specified
…/wp-content/plugins/wp-social-toolbar/images/gray/facebook.png” />
Line 6338, column 203: required attribute “alt” not specified
…/wp-content/plugins/wp-social-toolbar/images/gray/linkedin.png” />
Line 6339, column 219: required attribute “alt” not specified
…/wp-content/plugins/wp-social-toolbar/images/gray/orkut.png” />
Line 6340, column 216: required attribute “alt” not specified
…/wp-content/plugins/wp-social-toolbar/images/gray/stumbleupon.png” />
Line 6341, column 188: required attribute “alt” not specified
…/wp-content/plugins/wp-social-toolbar/images/gray/digg.png” />
Line 6342, column 193: required attribute “alt” not specified
…/wp-content/plugins/wp-social-toolbar/images/gray/tumblr.png” />
Line 6349, column 266: required attribute “alt” not specified
…olbarpro.com/credit/daddydesign.png” /></div><div class=”wpcs-share-icons”…

http://wordpress.org/extend/plugins/wp-social-toolbar/