page goes all the way up when this script is activated

page goes all the way up when this script is activated

hi,

i have this script: http://www.plaatscode.be/5315/

Now when i am scrolled halfway the page, i click on "bestellen" (last line in the script), my page jumps all the way back to the top, and i need to scroll down again to see my div that has just appeared. Any idea how to correct this?

thanks!

Matt