Adding image hover and alt tags to an image

One can get image hover effect detail at below link
http://anshuldudeja.blogspot.com/2009/03/how-create-image-hover-effect-in.html

Method to add alt tags in an image is as given below:
<a href="http://xxx" target="_blank" alt="Blogger Widgets"><img src="http://img2.pict.com/aa/ae/97/16680dfb7c10435cbefea4aa04/4OXiK/geneliadsouzawallpaperspicturesd.jpg"/></a>

One can see another example of adding alt tag as given below
<a href="http://www.indian-share-tips.com/2009/04/rakesh-jhunjhunwala-views-on-election.html" target="_blank" alt="Rakesh Jhunjhunwala image photo"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEij5J4j2SBWxFOs2sVj-KsZiksM-IYFWDke9o3_0rHzvydQwyXV7GSGVDTjvTXcBuNkHvCk_SRBK9ipxHq-jReHFhHljkDUkAfnrXruKrJYU3ocr-YhflM_g5fNvZl5GtfTebSrLOXPcDw/s320/Rakesh+Jhunjhunwala.jpg" /></a>
Result post adding alt tag can be seen as given below
http://www.indian-share-tips.com/2009/04/rakesh-jhunjhunwala-views-on-election.html
Another example neatly explained for alt tag is available at
http://www.amitbhawani.com/blog/seo-alt-title-attributes-images/
Final outcome for an image tag is as below:
<a href=â��Article URLâ��><img src=â��Image URLâ�� alt=â��Image Nameâ�� Title=â��Image Nameâ��></a> 

? is  representing inverted colan "