function cal_mortgage(mf){

  var m_loan = mf.m_loan.value;

  m_loan=m_loan.replace(/[$\,\%\+]/g,'');

  var m_rate = mf.m_rate.value;

  m_rate=m_rate.replace(/[$\%\+]/g,'').replace(/[\,]/g,'.');

  var m_year = mf.m_year.value;

  m_year=m_year.replace(/[$\,\%\+]/g,'');



  var oneyear   = 12;

  var interesse = m_rate / (oneyear * 100);

  var periods  = m_year * oneyear;

  var periodpayment = ( m_loan * ( interesse / ( 1 - Math.pow( (1 + interesse) , (0 - periods) ) ) ) );

  periods = 0 - ( Math.log( 1 - (interesse * m_loan / periodpayment) ) / Math.log(1 + interesse) );

  var interesse_total = (periodpayment * periods) - m_loan;

	document.getElementById('mortgagesummary').innerHTML="<table width=100% style='font-size:14px;color:#117d13;line-height:16px;font-family:arial; font-weight:bold;background:#f5ffcf;'><tr align=right><td><b>Rata mensile:</b></td><td><b>&nbsp;&nbsp;&euro; "+Math.round(periodpayment*100)/100+"</b></td><tr><tr align=right><td>Totale interessi:</td><td>&nbsp;&nbsp;&euro; "+Math.round(interesse_total*100)/100+"</td></tr></table>";

}