function calculate()
{
	val = document.getElementById('cal_amount').value;
	cal_amount_val = isNaN(parseFloat(val)) ? 0 : Math.abs(parseFloat(val));
	document.getElementById('cal_amount').value = cal_amount_val;	
	cal_what_val = parseFloat(document.getElementById('cal_what').value);
	cal_to_val = parseFloat(document.getElementById('cal_to').value);	
	res = parseInt((cal_amount_val * cal_what_val * 1000) / cal_to_val) / 1000;
	document.getElementById('cal_res').innerHTML = '<strong>'+res+'</strong>';
	
	
	
}

function init()
{
	setInterval('calculate();', 100);
}

window.onload = init;