[transitbus]

If I may...

Try this instead. It works great in IE 6 & 7 and Firefox 1.5x

/* BEGIN Image resize */
#posts IMG
{
    max-width: 95%;
    height: expression(this.height > 1024 ? "1024px" : true);
    width: expression(this.width > 768 ? "768px" : true);
}

#collapseobj_threadreview IMG {
    max-width: 95%;
    height: expression(this.height > 1024 ? "1024px" : true);
    width: expression(this.width > 768 ? "768px" : true);
}
/* END Image resize */