HELP NEEDED! entering variables with input textbox

1

/*
this code works so far, but when i also try to replace the hardcoding of var xPROGRESS, var YPROGRESS, var LINElengthPROGRESS it does not work anymore???
I do not see the logic in that !
any hint is welcomed
thanx

on the stage:
input textboxes: STAx, STAy, DUB, ROTA, XPROG etc.
enter_btn
*/


this.enter_btn.onRelease = function() {
	var STARTx = STAx;
	var STARTy = STAy;
	var DUBLICATIONS = Number(DUB.text);
	var ROTATION = ROTA;
	var xPROGRESS = 10;                              //Number(xPROG.text);
	var yPROGRESS = 5;                                //Number(yPROG.text);
	var LINElenghtSTART = LINElenghtSTA;
	var LINElenghtPROGRESS = 10;           //Number(LINElenghtPRO.text);
	this.line_mc._visible = 0;
	for (var i = 1; i<=DUBLICATIONS; i++) {
		duplicateMovieClip("line_mc", "lineX_mc"+i, i);
		_root.lineX_mc1._x = STARTx;
		_root.lineX_mc1._y = STARTy;
		_root.lineX_mc1._rotation = ROTA;
		_root.lineX_mc1._height = LINElenghtSTART;
		_root["lineX_mc"+i]._x = _root["lineX_mc"+(i-1)]._x+xPROGRESS;
		_root["lineX_mc"+i]._y = _root["lineX_mc"+(i-1)]._y+yPROGRESS;
		_root["lineX_mc"+i]._yscale = _root["lineX_mc"+(i-1)]._yscale+LINElenghtPROGRESS;
		_root["lineX_mc"+i]._rotation += ROTATION;
	}
};

:confused: