```
<script language="javascript" type="text/javascript">
    function pageLoad() {

            ShowPopup();

     }
</script>

```

The above code will call `ShowPopup` on `pageLoad()` . 
I need that `ShowPopup` method to work only first time 

> 
> ie;
> 
> 
> 

need to check `IsPostback` Property of the `Page`.

Can i do this from client side(JavaScript) .?