Hi Naish,

If button is disabled, then you may use __doPostBack. Below is example:

<script type="text/javascript">
function WebImageButton1_Click(oButton, oEvent)
{
 // if that is external event (not from WebImageButton.ClientSideEvents),
 // then to get reference to WebImageButton1 you may use:
 //var oButton = ig$('<%=WebImageButton1.ClientID%>');
 oButton.setEnabled(false);
}
function triggerClick()
{
 var oButton = ig$('<%=WebImageButton1.ClientID%>');
 if(oButton.getEnabled())
  oButton.click();
 else
  __doPostBack(oButton.getUniqueID(), '0');
}
</script>
<igtxt:WebImageButton ID="WebImageButton1" runat="server" Text="Once">
   <ClientSideEvents Click="WebImageButton1_Click" />
</igtxt:WebImageButton>
<input type="button" value="Trigger Click Event" onclick="triggerClick()" />