How to raise a javascript function from another Form ?

[vilrbn]

Hello,

I use two forms, having each the same two frames.
When I go from Form2 to Form1, I check a radio button in Form1 (page_load).
This runs a javascript function that makes visible buttons on another frame (EnableBottom).
Code behind is working fine, but I don't manage to raise the onclick Event which is on client side.Except if I click on rdb1 (EnableBottom() is correctly launched).

Here's my Form1 code:

Code-behind:

Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
rdb1.Add("onClick", "javascript:EnableBottom();")

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
If Not Page.IsPostBack Then
...
rdb1.Checked = True
rdb1_CheckedChanged(sender, e)

HTML:
<script>
function EnableBottom()
{
parent.frBottom.Enable();
}
</script>