great drop in google rank

i just redesigned and layout my website. My site is ranked 4 in first page of google for my keyword but few hours later, my rank dropped to 15 which is 2nd page of the google. Is this normal or what? I am outranked by useless youtube links and other crap sites.

nevermind. i just pingged it and waited for an hour and i got my first page back but in rank 8