Why isn't Pokemon Emerald working?

I've dowloaded Pokemon Emerald (U) rom from this site, and i've extracted the rom from the .rar file. But when I open it up in Visual Boy Advance the screen just goes white and does nothing. Can somebody please help me to get this rom running or tell me where i can find one that works?

Wrong section and read this: https://www.romulation.org/forum/index.php/topic,1462.0.htmlAlso read the rules as telling you where to get a "working" one is against them, and even asking for a source is reason enough for a warning.

I'm sorry i was unaware of this. But thankyou for your help it is working now.
Cheers :)