Problem with dynamic radio button

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Hi freinds,
Iam creating radio buttons at runtime it is working fine in internet explorer but with firefox it is very difficult to select radio button.

I am using ASP.NET c#,version 2.0
this is the code iam using,

RadioButton rd = new RadioButton();
rd.ID = "id" + i.ToString();
rd.Text = ans[i];
rd.GroupName = "dynrd";

And binding needed RB to Panel like this,

Panel1.Controls.Add(rd);

How to solve it....I can select radio button but it is very difficult to select.