.
HTML :
<span id='myHiddenDiv' style='display: none'>
<img src='' id='myAnimatedImage' align='absmiddle'>
</span>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" OnClientClick="showDiv();" Text="Search" />
( div, ), img-. OnClientClick "showDiv();" client script, :
<script language='javascript'>
function showDiv()
{
document.getElementById('myHiddenDiv').style.display ="";
setTimeout('document.images["myAnimatedImage"].src="work.gif"', 200);
}
</script>
setTimeout, DOM reset src 200 . , , , , , - , .