Iframe transparency problem with OPERA

Hi,

I am using iframe to load dynamic content so that whole page not refresh at the time of click.
Here is link, globtier.com/portfolio/index.php

But in OPERA browser, it is showing white background color in iframe, while I am giving allow transparency is equal to true.

Here is code,
<iframe frameborder=“0” src="#.htm" height=“300” width=“100%” scrolling=“yes” marginwidth=“0” marginheight=“0” allowtransparency=“true”>
</iframe>

Thanks in advance…!
Jits