(Flash8) Syntax problem with attachMovie

Howdy, this works...

Code:

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update_area1.attachMovie("mc1","mc1",1);

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... but I would like to achieve it dynamically as in...

Code:

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var update_area_number:Number = 1
var updateName:String = "update_area" + update_area_number; // "update_area1"
updateName.attachMovie("mc1","mc1",1);

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Thanks in advance

PHP Code:

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var update_area_number:Number = 1
var updateName:String = "update_area" + update_area_number; // "update_area1"
this[updateName].attachMovie("mc1","mc1",1); 


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Excellent, thank you