javascript not working in firefox

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ASP.NET

Javascript

Hi all,
I have used dew player in my application. I inserted that object in my master page. In child form while loading the page the player is not detected and saying dewplay() is not a function.

Here is my code

<script type="text/javascript" >




        var dewp = document.getElementById("dejs");


        dewp.dewplay();

        v = document.getElementById("<%=txthpos.ClientID%>").value;// to play from current position when page is refreshed

        dewp.dewsetpos(v);

but if alert is given its working fine