function addCommas(nStr)
{
	nStr += '';
	var x = nStr.split('.');
	x1 = x[0];
	x2 = x.length > 1 ? '.' + x[1] : '';
	var rgx = /(\d+)(\d{3})/;
	while (rgx.test(x1)) {
		x1 = x1.replace(rgx, '$1' + ',' + '$2');
	}
	return x1 + x2;
}

function calc() {

	var x=document.getElementById('xx').value;
	var y=document.getElementById('yy').value/10;
	var z=document.getElementById('zz').value;

	if((y*10) < 0) {
		alert('For conversion rate please enter a number between 1 and 10');
		return;
	}
	if((y*10) > 11) {
		alert('For conversion rate please enter a number between 1 and 10');
		return;
	}

	var result=(x*y)/(z/100);

	if(isNaN(result)) {
		alert('Please complete all fields correctly');
		return;
	}

	result=result.toFixed(2);
	result=addCommas(result);
	document.getElementById('result').innerHTML='\
		With an average profit margin of <B>$'+x+'</B> and expected ROI of <B>'+z+'%</B> your <B>cost per lead is $'+result+'</B><BR><BR>\
\
		If you would like to discuss how Pro Internet Marketing can assist you in generating sales leads, <STRONG>call us on (03) 9863 8380</STRONG> or fill in the form below.\
	';

	document.getElementById('formdiv').style.display='';

	var form=document.getElementById('form');

	form['x'].value=x;
	form['y'].value=(y*10);
	form['z'].value=z;
	form['result'].value=result;

}