Server control add from Javascript

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ASP.NET

Javascript

Hello Friends,
I m trying to Add server control from javascript.

it add on the page as well as it shows on page.

But i can't access this control on server side.

Code:

function Append_control() {
            //debugger;
            var panel1 = document.getElementById("<%= pnlRepeatStep1.ClientID %>").innerHTML;
            var panel = document.getElementById("<%= Panel1.ClientID %>").innerHTML;
            //panel = panel.replace(/ConterPlaceHolder1_/g, "ConterPlaceHolder1_D" + count);
            var new_pnl = document.createElement("DIV");
            new_pnl.id = "Panel2";
            new_pnl.innerHTML = panel;

            document.getElementById("<%= pnlRepeatStep1.ClientID %>").appendChild(new_pnl);
            return false;

}

Can any body has this solution.
or any alternate solution for the same.

Thanks in Advance.