var unit = "metric";

function unitSwitch() {

	switch(unit) {
		case "metric" :
		var newHeight = heightEnglish;
		var newWeight = weightEnglish;
		unit = "english";
		break;
		case "english" :
		var newHeight = heightMetric;
		var newWeight = weightMetric;
		unit = "metric";
		break;		
	}

	document.getElementById("height").innerHTML = newHeight;
	document.getElementById("weight").innerHTML = newWeight;

/*
	var height = document.createTextNode(newHeight);
	var elemHeight = document.getElementById("height");
	var oldHeight = elemHeight.replaceChild(height, elemHeight.firstChild);

	var weight = document.createTextNode(newWeight);
	var elemWeight = document.getElementById("weight");
	var oldWeight = elemWeight.replaceChild(weight, elemWeight.firstChild);
*/
}