An image-map, with clickable areas, and a target attribute:

Edit code and click me	Your Result (Some examples do not work in Google Chrome):
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> </head> <body style="font-family:Arial, Helvetica, sans-serif;color:#3c3c3c;"> <p>Click on one of the planets to watch it closer:</p> <img src="/images/353915main_image_1377_428-321.gif" alt="Planets" width="350" height="263" usemap="#planetmap"> <map id="planetmap" name="planetmap"> <area shape="rect" coords="203,104,343,241" alt="Sun" title="sun" href="http://xhtml.co.il/tryit/sun.html" target="_blank" > <area shape="circle" coords="92,98,56" alt="Mercury" title="Mercury" href="http://xhtml.co.il/tryit/mercury.html"> </map> </body> </html>
Edit the code above and click to see the result	www.xhtml.co.il - Try it yourself