Passing a variable to set a movieclip location

in frame 1 of the movie have defined following:

var cl_y=502.0;

elsewhere, running following script:

-- seaty original position of movie clip defined in frame 1
var seaty = this+"_y";

-- resets position of movie clip original position
this._y = seaty;

(note - setting _y position in code in order simplify forum post)

i expected this._y = seaty; reset position of movie clip original position defined in frame 1. however, nothing happens.

i have used trace () discover value of seaty:
running trace(seaty) produces _level0.cl_y

please note trace(seaty) not equal value of _level0.cl_y (which wanting achieve)

i tried replacing:
this._y = seaty;
with following:
this._y = level0.cl_y;

and produces desired result (moving movieclip original position)

even though seaty = level0.cl_y
why work:
this._y = level0.cl_y;

and yet doesn't work:
this._y = seaty;

(i need work because need use same function reset position of numerous movieclips, different original positions)

many in expectation

i may missing something, believe seaty declaration should like:
var seaty = this._y //stores orinial _y value

this+"_y" return string reference movie clip. should use above, or if whatever reason doesn't work, think trying this:
var seaty = this["_y"]

i hope helps, let me know...

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