This is a sample script i use to show a blinking string:
<script type="text/javascript">
function doBlink() {
var blink = document.all.tags("alarm") // <-- GET THE TAGS
for (var i = 0; i < blink.length; i++)
blink[i].style.visibility = blink[i].style.visibility == "" ? "hidden" : ""
}
function startBlink() {
if (document.all)
setInterval("doBlink()", 1000)
}
window.onload = startBlink;
</script>
...
<alarm><asp:Label ID="lblAlert" runat="server" Text="ALARM!"></asp:Label></alarm>