如何解决IE中没有鼠标悬停在图像上时不显示边框的问题

I am trying to create a rather simple effect on a set of images. When an image doesn't have the mouse over it, I'd like it to have a simple, gray border. When it does have an image over it, I'd like it to have a different, "selected", border.I am trying to create a rather simple effect on