Issue in binding javascript function to page in master page

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ASP.NET

Hello friends,
I was trying to create fix header grid.
When i tried in simple aspx page, its working fine.
When i tried the same in using master page, the javascript function is not getting called.

This is my javascript function

 function CreateGridHeader(pnlGVForecast, GridView1, HeaderDiv) 
{
...
}

This is how i bind it to page

protected void Page_Load(object sender, EventArgs e)
    {
ClientScript.RegisterStartupScript(this.GetType(),
               "CreateGridHeader", "<script>CreateGridHeader('pnlGVForecast', 'gvForecastSummary', 'HeaderDiv');</script>");
}

May i know why there such problem??

Thanks in advance