var janUsage;
var febUsage;
var marUsage;
var aprUsage;
var mayUsage;
var junUsage;
var julUsage;
var augUsage;
var sepUsage;
var octUsage;
var novUsage;
var decUsage;
var windOption=5;

function toDollarsAndCents(n)
{
	if(isNaN(n))
		return 0.00
	else
	{
		var s = "" + Math.round(n * 100) / 100
		var i = s.indexOf('.')
		if (i < 0) return s + ".00"
		var t = s.substring(0, i + 1) + s.substring(i + 1, i + 3)
		if (i + 2 == s.length) t += "0"
		return t
	}
}

function getCost(form)
{
	var totalCost=0;
	
	form.janCost.value = toDollarsAndCents(form.janUsage.value*(windOption/100)*0.025);
		totalCost+=parseFloat(form.janCost.value);
	form.febCost.value = toDollarsAndCents(form.febUsage.value*(windOption/100)*0.025);
		totalCost+=parseFloat(form.febCost.value);
	form.marCost.value = toDollarsAndCents(form.marUsage.value*(windOption/100)*0.025);
		totalCost+=parseFloat(form.marCost.value);
	form.aprCost.value = toDollarsAndCents(form.aprUsage.value*(windOption/100)*0.025);
		totalCost+=parseFloat(form.aprCost.value);
	form.mayCost.value = toDollarsAndCents(form.mayUsage.value*(windOption/100)*0.025);
		totalCost+=parseFloat(form.mayCost.value);
	form.junCost.value = toDollarsAndCents(form.junUsage.value*(windOption/100)*0.025);
		totalCost+=parseFloat(form.junCost.value);
	form.julCost.value = toDollarsAndCents(form.julUsage.value*(windOption/100)*0.025);
		totalCost+=parseFloat(form.julCost.value);
	form.augCost.value = toDollarsAndCents(form.augUsage.value*(windOption/100)*0.025);
		totalCost+=parseFloat(form.augCost.value);
	form.sepCost.value = toDollarsAndCents(form.sepUsage.value*(windOption/100)*0.025);
		totalCost+=parseFloat(form.sepCost.value);
	form.octCost.value = toDollarsAndCents(form.octUsage.value*(windOption/100)*0.025);
		totalCost+=parseFloat(form.octCost.value);
	form.novCost.value = toDollarsAndCents(form.novUsage.value*(windOption/100)*0.025);
		totalCost+=parseFloat(form.novCost.value);
	form.decCost.value = toDollarsAndCents(form.decUsage.value*(windOption/100)*0.025);
		totalCost+=parseFloat(form.decCost.value);
	form.totalCost.value=toDollarsAndCents(totalCost);
}

function setUsage(usage, month)
{
	if(month=='jan')
		janUsage = usage.value;
	if(month=='feb')
		febUsage=usage.value;
	if(month=='mar')
		marUsage=usage.value;
	if(month=='apr')
		aprUsage=usage.value;
	if(month=='may')
		mayUsage=usage.value;
	if(month=='jun')
		junUsage=usage.value;
	if(month=='jul')
		julUsage = usage.value;
	if(month=='aug')
		augUsage=usage.value;
	if(month=='sep')
		sepUsage=usage.value;
	if(month=='oct')
		octUsage=usage.value;
	if(month=='nov')
		novUsage=usage.value;
	if(month=='dec')
		decUsage=usage.value;

}

function setWindOption(wind)
{
	windOption = wind.value;
}

function clearForm(form){
form.windOption.value="0";
form.janUsage.value="0";
form.janCost.value="";
form.febUsage.value="0";
form.febCost.value="";
form.marUsage.value="0";
form.marCost.value="";
form.aprUsage.value="0";
form.aprCost.value="";
form.mayUsage.value="0";
form.mayCost.value="";
form.junUsage.value="0";
form.junCost.value="";
form.julUsage.value="0";
form.julCost.value="";
form.augUsage.value="0";
form.augCost.value="";
form.sepUsage.value="0";
form.sepCost.value="";
form.octUsage.value="0";
form.octCost.value="";
form.novUsage.value="0";
form.novCost.value="";
form.decUsage.value="0";
form.decCost.value="";
form.totalCost.value="";
}