bug on creating dropdown menu

HI, expert

Please help me to solve problem for my website.

I’ve made drop down menu on my “photo gallery” menu…
Photo Gallery
-culture
-landscape

the drop down list itself is working, but I still can click “photo gallery” menu and it shows a blank page. I don’t want to see that blank page. When I click “Photo Gallery” menu, I only want to see the drop down menu.

Help me please…..

Thanks in advance