How to use images for skins without embedding them in the external style sheet

I'm trying to create a run time css-based swf which DOES NOT have embedded images, but rather picks them up from the file system.

For example,my Current .css file has this piece of code:

.paySeat开发者_如何转开发BundleAvailable {
    upSkin: Embed("../images/common/pay_seat_bundle_available.gif");
    overSkin: Embed("../images/common/pay_seat_bundle_available.gif");
    downSkin: Embed("../images/common/pay_seat_bundle_available.gif");  
}

I dont want the CSS based SWF to have all the images embedded as I have a lot of images. Rather I want the images to be loaded at runtime from the path specified.

I tried using 'Url' in place of 'Embed' , but it throws 'error #1034 type coercion' error.

Help Please!! What is the correct approach?

Create a general skin that does all states (up, over, down, etc) which only has one Image Object. Set the source of that Image object to the appropriate strings and the Image will then do an http call to that image automatically without embedding anything.