description:
[regression]cancel button of parameter dialog doesn't work

build number: 
2.6.0.v20100309-0630

steps to reproduce:
1, new a report parameter
2, preview in layout
3, click cancel button

expected result:
the dialog is closed

actual result:
the dialog is still open.

error log:
fixed by providing a workaround if newer internal browser doesn't support status text change.
verified in 2.6.0.v20100525-0630 build