How can I control the color and opacity of the circle?

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6:48 pm on Dec 19, 2008 (gmt 0)

when the white circle is placed above the red image

how can I control the color and opacity of the circle?

thank you

[edited by: eelixduppy at 8:46 pm (utc) on Dec. 19, 2008]
[edit reason] no screenshots, please [/edit]

4:23 am on Dec 20, 2008 (gmt 0)

Can you provide some more specifics without linking to your site or a screenshot?