Problem with "Restore down" button when resizing IE by window.resizeTo()

Hello, everyone.

I got a problem with when I tried to resize a maximized IE.

I opened a IE window and clicked the "Maximize" button,

then I wrote this javascript codes to resize IE:

window.resizeTo(800, 600)

it worked fine, but the button on the top right of IE was still "Restore down", it didn't changed back to "Maximize".

Can anyone tell me a solution about this.

Thanks