getURL Not following parameters?

Content
1

FP 10
AS 2.0 (Has to be 2.0, i’m working out of a template that i didnt create, and converting it just breaks the whole thing)

on (click) {
			var lname:String = _parent.lname.text;
			var lpass:String = _parent.lpass.text;
			trace(lname);
	        getURL("http://www.mysite.com/testform.php", "_blank", "POST");
			_parent._parent.gotoAndPlay(31);
}

(The gotoandplay is unrelated)
the trace returns the correct value.
However, when the window opens, I get no post variables, and the URL is:

http://www.mysite.com/testform.php?tfList=[object+Object]&invalidateFlag=false&__labelPlacement=right&__toggle=false&enabled=true&_minHeight=0&_minWidth=0&__width=100&__height=22&stylecache=[object+Object]&useHandCursor=false&rolloverIcon=falseUpIcon&childrenCreated=true&__f_click=[type+Function]&initializing=false&upSkin=_level0.login.login.instance40.instance41.fus&skinName=_level0.login.login.instance40.instance41.frs&methodTable=&phase=rollover&rolloverSkin=_level0.login.login.instance40.instance41.frs&downSkin=_level0.login.login.instance40.instance41.fds&keyHandler=[object+Object]

What am i doing wrong?