function checkban() {
	if (document.layers||document.all||document.getElementById)
		return checknumber()
	else
		return true
}

function checknumber(){
	var x=document.nicoretteCalc.howMany.value;
	var y=document.nicoretteCalc.averagePrice.value;
	var anum=/(^\d+$)|(^\d+\.\d+$)/
	if (anum.test(x) && anum.test(y)) {
		return findSpend(x, y);
	}
	else {
		alert("Please input a valid number!")
		return false;
	}

}

function findSpend(howMany, averagePrice) {

	var spendPerDay;
	var spendPerYear;
	var spendEveryTenYears;
	var cigarettesPerPack = 20;

	if (howMany <= 0) {
		alert("Please enter a number greater than zero");
		return false;
	}
	else {
		spendPerDay = averagePrice * (howMany/cigarettesPerPack);
		spendPerYear = spendPerDay * 365;
		spendEveryTenYears = spendPerYear * 10;
		writeToFields(spendPerYear, spendEveryTenYears);
		return false;
	}
}


function writeToFields(val1, val2) {

	//convert values to 2 dp
	newVal1=parseInt((val1*100))/100;
	newVal2=parseInt((newVal1*1.3));
abc=parseInt((document.frm.worth1.value));
	document.nicoretteCalc.spend1.value = newVal1;
	document.nicoretteCalc.spend2.value = newVal2;
	document.frm.smoke.value=parseInt(((abc*14)+newVal1));
}