Blink Image with jQuery

I had used "Image blink" java script function with <blink> tag as:

<blink><asp:Image ID="imgwaterlevel" runat="server" Width="35" Height="35" /></blink>

but it is not working in Firefox browser. How can i fix this problem??

Below is my javascript for "image blink":

<script type="text/javascript">
    spe = 500;
    na = document.all.tags("blink");
    swi = 1;
    bringBackBlinky();
    function bringBackBlinky() {
        if (swi == 1) {
            sho = "visible";
            swi = 0;
        }
        else {
            sho = "hidden";
            swi = 1;
        }
        for (i = 0; i < na.length; i++) {
            na[i].style.visibility = sho;
        }
        setTimeout("bringBackBlinky()", spe);
    }
</script>

Is there any other javascript for "image blink" which can work in all the browsers???

please reply.