ASP.NET 2.0: Bug - XHTML - Javascript Rendering

Suppose the following scenario:

• Default XHTML conformance (transitional).
• Webform with textboxes, submit button and RequiredFieldValidator fields.

Since submit button onsubmit attribute is rendered as follows in IE 7:

javascript:WebForm_DoPostBackWithOptions(new 
WebForm_PostBackOptions("ctl02", "", true, "", "", false, true))"

It causes javascript error in IE 7 (annoying small yellow js error icon at the bottom-left). Missing semi-colon [ ; ]. While everything works fine (form submits normally).

I don't get javascript error when either of the following:

1. Using FF.
2. Using enableclientscript="false" attribute for RequiredFieldValidator (no javascript, validation is server-side).
3. Using Legacy attribute for XHTMLconformance in web.config.

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