Opacity? Options

[x3chrissyx3]

div.blogheader, .caption {
/* edits the dates */
font-family:Comic sans ms;
text-transform:uppercase;
font-size:11px;
line-height:30px;
font-weight:bold;
filter: alpha (opacity=100, finishopacity=0, style=2);
height: 1px;
background-color:#9966ff;
color:white;
letter-spacing:1px;
text-align: center;
}
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Okay, the above code with the color "9966ff" was what I was going to change my color to when I changed my xanga background to black. This is the code that kinda fades the blog header, but when I put my xanga background to black, the purple color (9966ff) becomes dark, and it fades to black, or near back. I was wondering if there was a way to go from that color, to lighter...without making the entire thing DARK and then fading to black.

let me know if it was confusing, I'll try to clarify.