To do that, you have to split the main image up into multiple images and then organize the code in a way that makes it look like one. Then you wrap the individual images in url tags to link them to other pages.
I'll do an example with your current signature to explain things better:






The above image has been split into six parts. Since there are no spaces between the codes, only a page return after the third image to make the next three images be on the bottom, it all fits together seamlessly. The code:
CODE
[IMG]http://i26.tinypic.com/qqdgfk.png[/IMG][IMG]http://i32.tinypic.com/b8tuoo.png[/IMG][IMG]http://i25.tinypic.com/1z1cocj.png[/IMG]
[IMG]http://i30.tinypic.com/21a2z9.png[/IMG][IMG]http://i27.tinypic.com/14vhj7.png[/IMG][IMG]http://i27.tinypic.com/qyfeqx.png[/IMG]
Now all you have to do is add the links and you're done:






Code:
CODE
[url="www.google.ca"][IMG]http://i26.tinypic.com/qqdgfk.png[/IMG][/url][url="http://runescape.salmoneus.net/forums/index.php?showtopic=295006"][IMG]http://i32.tinypic.com/b8tuoo.png[/IMG][/url][url="http://runescape.salmoneus.net/forums/index.php?act=idx"][IMG]http://i25.tinypic.com/1z1cocj.png[/IMG][/url]
[url="http://runescape.salmoneus.net/"][IMG]http://i30.tinypic.com/21a2z9.png[/IMG][/url][url="www.runescape.com"][IMG]http://i27.tinypic.com/14vhj7.png[/IMG][/url][url="www.tinypic.com"][IMG]http://i27.tinypic.com/qyfeqx.png[/IMG][/url]
When you make your own, be sure to tally up the file size of all the individual images to check it before putting it in your signature. I saved the images as .png in Paint for the example, which ended up making the total file size much too large to use for a signature.