[jQuery] [blockui] bug with jquery 1.4 a1

[OALite]

        $('#item').block({message:(function(o){
            var c=$('#alert').clone();
            return c;
        })(this)});

do not work with jquery 1.4 a1

error info by firefox 3.5

Error: uncaught exception: [Exception... "Could not convert JavaScript
argument arg 0 [nsIDOMViewCSS.getComputedStyle]"  nsresult:
"0x80570009 (NS_ERROR_XPC_BAD_CONVERT_JS)"  location: "JS frame ::
http://localhost/media/jss/jquery.js :: anonymous :: line 29"  data:
no]