Millisecond Forums

Hi, just wondering if there is a way to change responsex and responsey from pixels to percentages? If not, is there a way to change picture.position to pixels if you're using a values attributes as x and y values? I'm trying to build a task where participants click on a target (or close to it). The target will be masked and change location on each trial. Participants will then receive points based on how close their response is to the target; more points the closer to the target the participant clicks. I've managed to build the basic skeleton, but just stuck with mismatched response units. Any helps is greatly appreciated.