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Yes, because you are calling the function instead of passing it's address. Remove the ().

Read this link.
http://www.w3schools.com/jsref/met_win_settimeout.asp

In the HTML you generate into the iframe you can reference functions in the parent like this.

window.parent.filterComments('Z')

You can get a reference to the Lianja system object in the parent...

You should not return it as a string you should output the string using

?? "file:...."

It is all described in the links.
http://www.lianja.com/community/showthread.php?3120-Answers-Web-service

Read that first...

You seem to misunderstand how a Webview works.

A Webview section in a desktop app is not connected to an http server.

You need to look at the Lianja system object and see what methods you can...