External swf data control from parent file- help!

i think its simple but not working- please help:

im loading an external swf from my parent swf:

loadMovie(“external.swf”, 4);

now, on external.swf i have a dynamic textfiled, which should be updated from the PARENT swf:

this is on PARENT swf file:
this.onRelease = function() {
_level4.mytextfield.htmlText = “some text”;

now it does not work- is there any other BETTER way to do it- please help.