HTML command doesent work when apllied Twice?!

Hi there,
Im an absolute beginner with Word Press and html. I found a really nice command that allows you to change pictures while hovering your cursor on top of them that looks like this –

<!–start_raw–><a href="Destination URL">
<img src='https://yourdomain.com/normal.jpg' style="width:200px; height:63px; border:0px solid #cc3300;" alt="Move your mouse over me" name="sub_but">
</a><!–end_raw–>

[Moderator Note: Please post code or markup snippets between backticks or use the code button.]

The problem is that if I use it twice in the same post it doesent work.
Anybody have an idea how to apply it on two or more separate images?