Check if a file exists in network dir (JS)

I've found an old post that has pointed me at:
if (myFile.exists){
alert("File Exists");
else
alert("File doesn't exist");
The problem is that when I use the path macname/volumes/dir/folder/folder/file.indd (which was created from variables) as myFile the script doesn't find a file that I know exists. All I get is the "File doesn't exist" alert.
Do I need to define myFile as being a string?
I'm still fumbling my way around JS, and converting Applescripts to JS to work cross-platform. Thanks in advance....

To get the path to a file i normally use this little script:
// JavaScript Document
var myFile = File.openDialog("Choose a File");
if((myFile != "")&&(myFile != null)){
    alert("Path: " + myFile + "\nType: " + myFile.type);
Perhaps this c/p can help you:
function mounter() {
    var myDocument = app.activeDocument;
    // we are saving the preview
    var destination = "/Volumes/myfoldername";
    //var destination = "/Users/tn/Documents/Tryksager/Design/";
    var volume = "afp://sub.dn.com/myfoldername";
    try {
        with (myDocument) {
            if(file_name = get_filename(name)) {
                    if (Folder(destination).exists) {
                    //alert("Folder exists: " + Folder(destination));
                    } else {
                    if (confirm ("Mount volume?", false, "Mount volume")) {
                        mount_volume();
                        // volume mounted, do what you need
                    } else {
                        alert("Could not mount");
    } catch ( err ) {
        // No error warning
    function mount_volume() {
        var myScriptFolderPath = pluginPath + "/resources/"; // Path to the applescript
        app.doScript(File(myScriptFolderPath + "mountvolume.scpt"),ScriptLanguage.applescriptLanguage);
//The applescript for mounting volumes
(*set user_name to ""
set Dialog_1 to display dialog "Please enter your user name" default answer ""
set the user_name to the text returned of Dialog_1
set pass_word to ""
set Dialog_2 to display dialog "Please enter your password" default answer "" with hidden answer
set pass_word to the text returned of Dialog_2*)
tell application "Finder"
    try
        mount volume "afp://mysub.mydn.com/myfolder" as user name "myusername" with password "mypassword"
    end try
end tell
Thomas B. Nielsen
http://www.nobrainer.dk

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Michael Chadwell
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Southwest Research Institute
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