Herency in Director (javascript)

Hi, i've a problem with this (in a single moviescript):

function CClipper ()
{
    this.mydummy2 = 0;
}

function CSprite ()
{
    this.dummy = 0;
}

CSprite.prototype = new CClipper ();

var test = new CSprite ();

That script hangs the Internet Explorer and Mozilla Firefox.

Im using Director MX 2004 with javascript syntax and running
on Windows XP 
(SP3)

Does anybody know what is wrong? 

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