I have write below code to stop marquee on mouseover. It's working f9 in firefox but not working in google chrome.
Here is code.
<marquee id="marqueeHeader" behavior="alternate" direction="left" onmouseover="this.setAttribute('scrollamount', 0, 0);" onmouseout="this.setAttribute('scrollamount', 6, 0);" loop="true" width="100%" bgcolor="transparent" runat="server">
<asp:label id="lblHeaderAnnoucement" runat="server" cssClass="marqueeText" Text ="Hi" />
</marquee>