problem invoking a method in javascript from codebehind

[coimbatorian]

We have many transactions for eg:CashDeposit that are defined in xml eg:CashDeposit.xml.
That XML is converted in to controls and placed in an usercontrol.
While loading each Transaction we are loading an js file dynamically eg:CashDeposit.js for CashDeposit.

This is the code for loading the Js file dynamically:

string txnJS = "../ClientScripts/" + SessionManager.CurrentTransName + ".js";
ScriptReference dynamicJS = new ScriptReference(txnJS);
scrMain.Scripts.Add(dynamicJS);//scrMain is asp:ScriptManagerProxy

then a method called ChkLoadBody() in the currentTransaction.js for eg:CashDeposit.js is invoked from the codebehind as:

this.Page.ClientScript.RegisterStartupScript(Page.GetType(), "OnLoad",
"ChkLoadBody()", true);
In this method we move some fields dynamically.

The issue is while performing the transaction at first time we are able to load the transaction.js and we can able to invoke the ChkLoadBody() from js.
But after performing the same transaction,when we try to execute the same at second time we cant able to invoke the ChkLoadBody() from js.
how to resolve this issue?

[Hack]

But after performing the same transaction,when we try to execute the same at second time we cant able to invoke the ChkLoadBody() from js.

What happens when you try? Do you get errors? If so what?

Or, are there no errors, but nothing happens?

[coimbatorian]

There are no errors
But it is not invoking the method in javascript
even when the RegisterStartupscript statement is executed?