var materialk;
var voltsk;
var cmask;
var voltage;

function calculate(form) {

	for (var i=0; i<=form.material.length; i++) {
	 if (form.material[i].selected) {

		materialk=eval (form.material[i].value);

		break
	  }
	}
	for (var i=0; i<=form.volts.length; i++){
	  if (form.volts[i].selected) {

		voltsk=eval(form.volts[i].value);
		
		switch(i) {

		  case 0:
		    voltage=120;
		    break;
		  case 1:
		    voltage=240;
		    break;
		  case 2:
		    voltage=208;
		    break;
		  case 3:
		    voltage=120;
		    break;
		  case 4:
		    voltage=277;
		    break;
		  case 5:
		    voltage=480;
		    break;
		  case 6:
		    voltage=277;
		    break;
		  case 7:
		    voltage=24;
		    break;
		  case 8:
		    voltage=48;
		    break;
		}

	break;
	}
}

	for (var i=0; i<=form.cmas.length; i++) {
	  if (form.cmas[i].selected) {

		cmask=eval(form.cmas[i].value);
		break
	  }
	}

	form.circularma.value=cmask
     form.voltdrop.value=Math.round((((2*materialk*(eval(form.distance.value))*(eval(form.amperes.value)))/cmask)*voltsk)*10)/10;
form.vdpercent.value=(Math.round(((eval(form.voltdrop.value))/voltage)*1000))/10;
	form.voltload.value=voltage-(eval(form.voltdrop.value));
}