Closing modal dialogs
I'm developing a flash application that has buttons that popup a window with more text, and information when they click it. This happens throughout the course. The close button is a square box with an "X" inside of it. The client upon review stated their review asked us to change it because felt the "X" looks like the page didn't load correctly (old browser can't load image icons??).
I have a strong intuition to stick with the "X" button because I feel it's more recognizable than having a button with "close window" label. Which is the best way to go about this? Also, is the "X" as a close button globally recognizable as a close button?