Way to trim precomp to current layer time?

I've got an animation pretty much done as far as timing goes and everything. Now I'm going back and editing some things that require adding a few layers to add some things to the current layer that already is trimmed appropriately to the correct time.
Anyone know of a script or something that will create a composition from a layer using the length of the layer's in and out point instead of the whole comp time?
Right now I'm opening the precomp, hitting "i" "b" "o" "n", then right clicking on the comp range bar, choosing trim to comp time. Then I go back to the main comp, move the time back to where the layer previously started and hitting "["
So it all goes by pretty quick, but I consistently have to do that like 20 times. And no, it isn't completely necessary, but if I have to give the file to someone else it makes it Much easier to see what's going on if they can see the actual length of a layer. If you leave it at default it appears the layer is needed for the entire composition.
So, is there a way to script that or something? I usually just need to do something like add some text, simulate a graphic display, or create some fake animated depth of field or something like that. I don't like to add more than one layer per action in the main comp, so if more is needed then i usually precompose it as to not have more than a hundred layers or so for the bulk of the comp.

Thanks, Andy.
Your comment that "just like most of adobe's links, it doesn't work" made me think that you were seeing more than one problem. If you are, please leave comments on the problematic pages. (Go ahead and mention them on this forum, too, if you like.)
I'll go ahead and remove the one that you just mentioned.
The usual way that we cull dead items from the Exchange is to read the comments that people leave on the items in the Exchange. We don't know what to fix if you don't tell us what's broken. Keep in mind that the Exchange is a place for user-submitted content. If a user doesn't maintain their entry, there's not a lot that we can do other than take the entry down.

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var ref = new ActionReference();                                                                                                               // create action reference
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ref.putEnumerated( charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );                   // what putEnumerated actually do ?
var layerDesc = executeActionGet(ref);                                                                                                      // get the corresponding layer descriptor
alert (layerDesc.getInteger(stringIDToTypeID("layerKind")));                                                                        / get its layerKind
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Greetings forumers,
I have been using Photoshop for years as a hobby and professionally. My employer recently upgraded our Mac Pro Quad-Core Intel Xeon computers to Photoshop CS4. The transition has been mostly painless accept for all the changes to the keyboard shortcuts (I'll live).
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Show Current Layer
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So any thoughts on how to make visible all layers in a document using an action that will work on any layered file?
We are constructing our files in CS4 and opening them in CS3 to run the action for our customer as a work around. Or we are manually toggling the visibility, but what fun is that when it used to be automatable?
Any help would be greatly appreciated.

You could try this script (CS4 only) to make all layers/groups visible. If it works for you, you could then call it as part of your action.
selectAllLayers();
var sl = getSelectedLayersIdx();
var sLayers = new Array();
for( var i = 0; i < sl.length; i++ ){
   makeActiveByIndex( [ sl[ i ] ], false );
   sLayers.push( activeDocument.activeLayer.name );
ShowAllLayers(sLayers);
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            var ref = new ActionReference();
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function selectAllLayers(){
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         }catch(e){
            selectedLayers.push( executeActionGet(ref).getInteger(charIDToTypeID( "ItmI" )));
      return selectedLayers;
function makeActiveByIndex( idx, visible ){
   for( var i = 0; i < idx.length; i++ ){
      var desc = new ActionDescriptor();
      var ref = new ActionReference();
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      if( i > 0 ) {
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         var idselectionModifierType = stringIDToTypeID( "selectionModifierType" );
         var idaddToSelection = stringIDToTypeID( "addToSelection" );
         desc.putEnumerated( idselectionModifier, idselectionModifierType, idaddToSelection );
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      executeAction( charIDToTypeID( "slct" ), desc, DialogModes.NO );

JMediaPlayer - get media duration, current playback time ... etc

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import com.sun.media.jmcimpl.PlayerControlPanel;
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if(mediaPane != null)
mediaPane.setSource(uri);
if(controlPanel != null)
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mediaPane.setAutoPlay(flag);
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The core object is JMediaPane with API to do what you want.
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Way to trim precomp to current layer time?

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