// calculator.js
function checknumber(field){
	var x=document.calcForm.field.value
	var anum=/(^\d+$)|(^\d+\.\d+$)/
	if (anum.test(x)) {
		testresult=true
	} else {
		alert("Please input a valid number!")
		testresult=false
	}
	return (testresult)
}
function calculateTax() {
	var calcFrm = document.calcForm;
	var residence = calcFrm.mainRes.value;
	var assets = calcFrm.otherAss.value;
	var foreign = calcFrm.foreign.value;
	var newTotal = (residence *1) + (assets *1) + (foreign *1);
	//window.alert(newTotal);
	var total = newTotal - calcFrm.liabilities.value;	
	//window.alert(total);
	var stageOne = (total - 285000);
	//window.alert(stageOne);	
	var stageTwo = stageOne * 0.4;
	//window.alert(stageTwo);
	//var final = round(stageTwo);
	//var disp = String(final);
	//window.alert(final);
	//ret = round(ret);
	disp = '£';
	var stageThree = Math.round(stageTwo *1);
	if (stageThree <= 0) {
		stageThree = 0;
	} 
	document.getElementById('calcResult').innerHTML = disp+stageThree;
}
function toggleCalcBtn() {
	var btn = document.getElementById('calcBtn');
	if (btn.innerHTML == '« Hide') {
		btn.innerHTML = 'Start &raquo;';
	} else if (btn.innerHTML == 'Start »') {
		btn.innerHTML = '&laquo; Hide';
	}
}