Added better alt attributes for improved usability

www/logos.php

@@ -10,9 +10,9 @@
 <h4><?=_("Collection 1 created by Christoph Probst (November 2004)")?></h4>
 
 <p>
-  <img src="logos/cacert1.png" alt="www.cacert.org" /><br /><br />
-  <img src="logos/cacert-free-certificates2.png" alt="www.cacert.org" />&nbsp;&nbsp;
-  <img src="logos/cacert-free-certificates3.png" alt="www.cacert.org" />&nbsp;&nbsp;<br /><br />
+  <img src="logos/cacert1.png" alt="www.cacert.org logo" /><br /><br />
+  <img src="logos/cacert-free-certificates2.png" alt="www.cacert.org logo" />&nbsp;&nbsp;
+  <img src="logos/cacert-free-certificates3.png" alt="www.cacert.org logo" />&nbsp;&nbsp;<br /><br />
   <img src="logos/cacert-grey.png" alt="www.cacert.org"  />&nbsp;&nbsp;
   <img src="logos/small-ssl-security.png" alt="www.cacert.org" border="0" /><br /><br />
 </p>