Calling a variable from a external txt file that is equal button name

Hello
I have a variable in an external txt file that is = the name
of my button. I have loaded the file in to flash in an object
called my_lv.
How do I make line three in the code valid ?
_root.map.name1900.onRollOver=function() {
this._alpha=20;
txName=my_lv.+(this._name); // this line is wrong!! I need
to place name1990._name in side the ().

do you have an object called "my_lv" and a child object have
named as "name1900" . ie "my_lv.name1900"\
if i am right then...
>> txName=my_lv.+(this._name); //
should be
txName= eval("my_lv."+ this._name)

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Calling a variable from a external txt file that is equal button name

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