well you have no closing <body> tag
you didn't close either of your final <big> tag
all of your script tags should either go inside of the HEAD tag or at the end of the body tag
why do you have so many big tags?
Can you please post a link to the live site where this can be accessed so we can take a look at the rest of the code? Or can you please post the rest of the code (I hope this isn't the entirety of it)