pageLoad() isn't fired

hi

I have an *.ascx user control and have a pageLoad function for it:

<script type="text/javascript">
    function pageLoad(sender, e)
    {
        alert('hi');
    }</script>

when I run the page from VS in my browser it isn't fired.

when I press Ctrl+ F5 it doesn't fire.After a couple of times it does and again it doesn't.

what could be the problem?

thanks in advance.