Hold my beer

gistfile1.txt

System.$win.on('mousemove', function(e) {
	nextX = e.clientX;
	diff = currX - nextX;
	var tmpVal = (Data.Active.shell.width * Data.Active.boxes[index].perc) * System.scale;
	var valMinusDif = tmpVal - diff;
	var newperc = (valMinusDif / (Data.Active.shell.width * System.scale));
	var percDif = newperc - Data.Active.boxes[index].perc;
	Data.Active.boxes[index].perc += percDif;
	Data.Active.boxes[index + 1].perc -= percDif;
	boxElements[index].update({
		perc: Data.Active.boxes[index].perc,
		width: System.roundInches(Data.Active.shell.width * Data.Active.boxes[index].perc)
	});
	boxElements[index + 1].update({
		perc: Data.Active.boxes[index + 1].perc,
		width: System.roundInches(Data.Active.shell.width * Data.Active.boxes[index + 1].perc)
	});
	renderData.render();
	currX = nextX;
});