Picture to link to label page or any webpage

"I have a picture on my side bar, I would like to link it to all labels containing say books. There are five post under that label, and when my guest push the picture of the books, I would like the page to pop up only the posts with the label, Books."

Well, that is easily done. First you have to be familiar with hyperlink, namely using <a href="URL of target webpage">anchor text (some text descriptive of target webpage)</a>. And since you want the link to go to the label page "Books", that URL will be the URL of the label page of "Books" which you can get by right-clicking on the label "Books" in the sidebar and selecting "Copy link location".

You also need to be familiar with uploading pictures to the web and getting the picture URL like what is described in Using Blogger to host pictures.

Now the required codes are

<a href="URL of target webpage"><img src="picture URL" /></a>

and if that is not clear enough, ask.