// JavaScript Document
window.onload = netCalc;

function netCalc(){

	matrlType = document.getElementById('matrl').value;
	gaugeType = document.getElementById('gauge').value;

	lengthft = document.getElementById('length').value;
	widthft = document.getElementById('width').value;
	heightft = document.getElementById('height').value;

	if  (matrlType == 'nylon'); 
		
		area = ((((lengthft*width)*2) + (lengthft * heightft)*2 ) + (widthft*heightft)*2)

	{
netAns = area * calc; 

}


}