>Hmm. Quick test:

        protected void Page_Load(object sender, EventArgs e)
>        {
>            theButton.Attributes.Add("onClick", "this.disabled=true; document.Form1.submit(); return false;");
>          //theButton.Attributes.Add("onClick", "document.Form1.submit(); this.disabled=true; return false;");
>
>            if (IsPostBack)
>            {
>                int i = 0; 
>                // If 'disabled' is first: Firefox - works. button disabled, postback
>                //                         Chrome - button disabled, no postback
>                // If 'submit' is first :  Firefox - postback, button not disabled
>                //                         Chrome - postback, button not disabled
>            }
>        }

Didn't test IE...
>>
>>But, despite the fact that this no support was only referencing to other controls, I believe it might have applied also to buttons. The situation might be caused because of the usage of "true" instead of "disabled". That is why I need to complete the installation of IE, currently in progress, and take a look at this.
>
>Pls let us know what you find

Before proceeding with more tests, can you adjust your code for "onclick" instead of "onClick"? I will only be able to test with IE 7 in about an hour. But, I think IE 7 might be case sensitive on that one. That would then explain the situation.