Image hover is a mouse over button. when you move
courser to button,you will see some animate on there.
you have to use two image for this.lets try it.
Image 1
Image 2
1. Log in to your blogger account and Go to "Posting" >> "New Post"
2. Paste below code
<a href="http://www.bloggertrix.com/">
<img src="http://i530.photobucket.com/albums/dd341/herrolim/donlot.png"
onmouseover="this.src='http://i530.photobucket.com/albums/dd341/herrolim/donlotOver.png';"
onmouseout="this.src='http://i530.photobucket.com/albums/dd341/herrolim/donlot.png';" /></a>
3. you can change http://www.bloggertrix.com/ with your link
done.