hot to adjust the alpha of a sprite?

[-=rhcp=-]

yo guys

i have made a site whit sprite on it. Behnd the sprite is a logo. How can i make it that u will only see the logo very "bad" ihope u know what i mean, so that i can read the text better!!!!

thnx in advance

rhcp

[4Drolla]

IF you wanna make it very hard to see, when u place it, make the alpha value like 25% (or whatever u think will look good.)

p.s. it would help if u posted the swi. too