HTML/CSS/Marquee Attributes/scrolldelay
"scrolldelay" determines the velocity at which the text appears to move inside a "marquee" element
<source lang="html4strict">
<HTML> <BODY> <marquee behavior="slide"
scrolldelay="150" bgcolor="#EEEEEE"> This marquee has ascrolldelay value of 150.
</marquee> </BODY> </HTML>
</source>