PS. My firefox is Ver. 3.6.3 ChineseEdit 2010.1

Try posting at the Web Development / Standards Evangelism forum at MozillaZine. The helpers over there are more knowledgeable about web page development issues with Firefox.
http://forums.mozillazine.org/viewforum.php?f=25
You'll need to register and login to be able to post in that forum.

If it is no link then there is probably something on that page that is covering that part.

Can you post a link?

You can use the DOM Inspector to investigate this problem.

• https://developer.mozilla.org/en/DOM_Inspector

The DOM Inspector (DOMi) has a menu item (Search > Select Element By Click) and a button to "Find a node to inspect by clicking on it" (left icon on the toolbar).

That allows to see which element gets selected if you click that link.

Also posted over here:
http://forums.mozillazine.org/viewtopic.php?f=9&t=2105501

This is the page in question.
http://www.hzmuseum.com/e_place/

Related to unescaped ampersands in the coding.
http://validator.w3.org/check?uri=http://www.hzmuseum.com/e_place/
http://www.htmlhelp.com/tools/validator/problems.html#amp

If you hover that page then you can immediatley see that there is an image (../images/place/map1.gif) in SPAN.hallmap_lv1 that is covering the links.

The A link is just above that image, so can be clicked.
The B link is covered by that image and can't be clicked.
Maybe make that image a background image.

This problem has been solved by move down image then let the hover item exposed upto front face.

This problem take places as something by chance that the hover items is covered by image span box which may look seem transparent

Thanks all for your kindly help! Special to cor-el!