This is my code: var newmarquee = document.createElement("marquee"); newmarquee.setAttribute("behavior","slide"); newmarquee.setAttribute("direction","left"); newmarquee.setAttribute("scrolldelay","1"); newmarquee.setAttribute("scrollamount","500"); newmarquee.innerHTML = xmlHttp.responseText; var Locate = document.getElementById("Start"); Locate.id = "Old"; newmarquee.id = "Start"; Locate.parentNode.insertBefore(newmarquee,Locate); Code (markup): The "slide and "left" settings work but thespeed settings don't, anybody got a clue?