от 0 до 48 вообще-то =)
Цитата:
random function
random(value:Number) : Number
Deprecated since Flash Player 5. This function was deprecated in favor of Math.random().
Returns a random integer between 0 and one less than the integer specified in the value parameter.
Availability: ActionScript 1.0; Flash Player 4
Parameters
value:Number - An integer.
Returns
Number - A random integer.
Example
The following use of random() returns a value of 0, 1, 2, 3, or 4: random(5);
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А вообще, лучше pole1=_root["abc"+(1+Math.round(Math.random()*50))];
з.Ы. И про _root тоже не мешает забыть...