browser cache emulation in jmeter?

Running some user-load tests with jmeter, and noticed that for each page load开发者_StackOverflow中文版 after the first load, the load sizes are similar. This leads me to believe that jmeter's simulation does not use browser cache emulation (e.g. the caching of css and javascript). Anyone know of a method for emulating browser cache in jmeter?

---

Try adding the Config Element HTTP Cache Manager introduced in JMeter v2.3.2

An example is here:

http://jmeter.apache.org/usermanual/component_reference.html#HTTP_Cache_Manager