Quote Originally Posted by mackey2001 View Post
I also realized, when i take mouse over the first picture, the path is

/images/products/u100-emotions.png

but when i take mouse over 2nd picture ( and same for 3rd) :
/images/large/products/u100-emotions_01_[/url]LRG.png


do u think this is the issue? how can i fix this?
That's not going to be the issue because that's how it should be named since there are multiple images for the same product.
It is probably the template you are using, not all templates support IH straight out of the box.