Although this great feature is only
for IE 5.0+, it's something worth learning. You can see that it provides
a lot of power to create complex effect with little or no coding, and that
alone makes up for this downside. You should now be able to code your own
dynamic expressions, and use the different methods provided to you, such
as setExpression(), expression(), getExpression(), removeExpression() and
recalc() to work with Dynamic Properties in your scripts. There is almost
not limit to what you can do with Dynamic Properties, so with some
experimentation, you should be able to create some truly stunning
effects.