function Calculate_new_size ()
{
	var psb = 0, pmu = 0, value = 0, cmvalue = 0, gain = 0, gain_m = new Array(0.3, 0.29, 0.28, 0.27, 0.26, 0.25, 0.24, 0.23, 0.22, 0.21, 0.20, 0.19);
	
	psb = parseFloat(document.getElementById('sb').value);
	pmu = parseFloat(document.getElementById('mu').value);
		
	for(i=0;i<pmu;i++) gain = gain + gain_m[i];
	gain = gain.toFixed(2);
		
	value 	= eval(gain) + psb;
	value 	= Math.round(value*100)/100;
	cmvalue	= value*2.54;
	cmvalue	= Math.round(cmvalue*1000)/1000;
		
	document.getElementById('newSize').innerHTML = 'Using a penis extender system for ' + pmu + ' month(s) can result in a new size of ' + value + '&quot; (' + cmvalue + ' cm)';
	
}