apply presets at different times

Hi all,

New to AE scripting, and was wondering if the following was possible. Any advice appreciated.

I've written some basic script which will apply presets at different times

if (time==2){

    myComp.applyPreset(myPreset);

    }

if (time==5){

    myComp.applyPreset(myPreset2);

    }

But the current time indicator has to be at that time for it to work . Is there anyway for the script to go through the timeline and evaluate each frame and apply the preset accordingly? I might be on the wrong track, so any direction would be great.

Thanks.