I picked up this "like" icon from iconfinder.com. Originally it was in black. I adjusted it to orange. To help the user, I'd like to have it be "hollow" (i.e. just a border - transparent in the middle) before they click it (i.e. before they "like" something) and solid like this after they click it. I can do the coding to swap image, but I need to create the "hollow" version of this.
I've got photoshop and illustrator and fireworks, but I'm a web developer, so I have no idea how to really use them. I tried a dozen different things I found online, but nothing is working. Any ideas what I could try?