
CSS Max Width
Sometimes you want to not break a layout, but you can't guarantee any image size. This is where the max-width CSS comes in. However, this will not work on IE. For IE, you have to fake it.
I use this
max-width: 100%; width: expression(this.width > 560 ? 560: true);
Oh and to overide it for things like google maps, just make sure to include them in a div and use:
#gmaps img {
max-width: none;
width: auto;
}

