Website problem. Please help!!!

[giyn]

Hi everyone,

I'm new to web design and I have similar problems with plumber. The website I created isn't appear properly on my client's browser (the menu on the right shifted to the left and the left hand side menu shifted down), but I don't have any problem with it. And here's the site: http://personaltesting.site11.com

Please help!!!!

Thanks in advance!!!