Results.ScorePoints manipulation as a work around for multiple response (any correct answer)

Hello 

Currently I am working on a quiz , were i have a multiple response question that any/all correct answers should be accepted as correct. However articulate doesn't support this feature. 

So as a work around, i have added triggers to the question slide to open the correct layer and add to the Results.ScorePoints 10 points using "execute JS " trigger.

var player = GetPlayer();
var temp_res = player.GetVar("Results1.ScorePoints");
temp_res=+10;
player.SetVar("Results1.ScorePoints",temp_res);

My problem is that the variable doesn't change. when i traced it using alert it gave me null.
Anyone have away to fix this. or am i doing something wrong  

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