browser scroll itself up

I have created a photo gallery in tabs. The problem is when i scroll down the browser window to click on the numbers of the photo gallery, the new photo opens but the explorer scroll it self up again. It is very annoying. here is the link of this website gallery.

http://www.meerab.info/gallery.html

Please bear with me as i am new to html/css. Can anybody help me??
I would really appreciate.
Thanks

example you have:
<a href="#" tabindex="1">7</a>

add onclick="return false;" like below
<a onclick="return false;" href="#" tabindex="1">7</a>