My horizontal menu got lost

[pralay]

Hi,
A serious thing happened.
Idesigned a site http://demo.diademtech.com/waterforlife/index.php with cms.
Now last day I had some changes to do and I did that.
But when I reopened  the site I saw my horizontal top nevigation got lost and in place of that a vertical nevigation with no css coming down the page.
I am really scared.
Can any one tell what happened and how to recover that?
It's urgent.

[pralay]

It seemed that I have solved that. There was a problem with CSS and I solved that.
Good Bye.