change the banner in wordpress

[Mohannad]

I have a site (Blog) based on wordpress. I need to change the banner which is a .jpg with flash file .swf

I tried to change it in .css but it did not work and as I read it will not work . I am new in these things . so could you please explain to me an easy way to make it.

(I am using the default theme in wordpress)

[MTsoul]

You'll have to change the theme itself to add Flash. You can't embed Flash with CSS...

[Mohannad]

ok, so where exactly should i change , because you know the theme is about .css files and .php files
so could you clarify more ?

[MTsoul]

In header.php, add in your code for inserting Flash where the image is.