How to detact if a file exist in a folder

How can I detact a file (a jpg or flv) exists in a folder?
The script that I can think of so far is like this,
var filename:String= "videos/vid test 0110.flv";
if (filename){
trace("well done");
}else{
trace("sorry");
Please help me on this problem if you know....
Thanks.
Lau

Sorry I have to rephrase the word - detect - to "check",
sounds more pricisely...
How can I check a file (a jpg or flv) exists in a folder?
for instance flash can check if there is an instance exist or
not on the timeline, for example a movie clip is called myMovie_mc.
if (myMovie_mc){
trace("myMovie_mc exist");
}else{
trace("sorry myMovie_mc doesnot exist");
This is checking the instance on the timeline... but what I
need is the check if a file (a flv file) exists or not in a folder
outside the fla file.
If that flv does exist in that folder ("videos" I called it),
then the flash will take some actions. if it does not exist, then
flash will do something else, like gotoAndPlay("default Intro").
It will be much appreciated if anyone of you can sort this
problem out for me.

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How to detact if a file exist in a folder

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