Yep... it should be fine as a short-term replacement solution.
You should be able to run your video card at AGP 8X (which is better than the 4X offered by your Intel mobo. Check this link
One more thing... your current Intel mobo only runs at a FSB of 533MHz (again check the same link
The new Gigabyte mobo runs at a FSB of 800MHz so you should definitely see some performance improvement there. Just one thing though... Is your ram DDR400 or DDR333 or DDR266 ? You need DDR400 to make full use of the new 800MHz FSB.
But I don't see any overclocking options on this Gigabyte mobo.... maybe I just missed out on something while viewing the webpage.
I know you are probably on a tight budget but I'd suggest you wait and save your money to get a good lasting mobo (which allows you to overclock) once you can. Why pay now and pay again later unless there's a problem with your current mobo and you need a quick replacement ?
Then again, it's up to you