function CalculateValue(target,feet,inches,size) {
	var fbm = document.getElementById(target);
	var ft = parseFloat(document.getElementById(feet).value) * 12;
	var ins = parseFloat(document.getElementById(inches).value);
	var xsection = parseInt(document.getElementById(size).value);
	
	setDivText(fbm, (new Number((ft + ins) * xsection)/144).toFixed(2)+" Board Feet");
}
function setDivText(target, text) {
	if (target.hasChildNodes()) { 
		target.replaceChild(document.createTextNode(text), target.firstChild);
	 } else { 
		target.appendChild(document.createTextNode(text));
	}
}