http://www.dynamicdrive.com/dynamici...lideinlink.htm

works fine without doc type.
as soon as you put <!DOCTYPE html>
it doesnt work on firefox or google chrome

i am using
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">