function calc(){
	
	var PV = Number(document.frm_calc.pv.value);
	var N = Number(document.frm_calc.n.value);
	var i = Number(document.frm_calc.i.value);

	
	var mPMT = 0;
	var wPMT = 0;
	var fPMT = 0;

    if (i >= 1.0) { i = i / 100;}
	i = i / 12;
	

	N = N * 12;


	var x = 1 + i;

   mPMT = ( PV * Math.pow(x,N) ) / ( ( ( Math.pow(x,N) - 1 ) / i ) );
   wPMT = ( PV * Math.pow(x,N) ) / ( ( ( Math.pow(x,N) - 1 ) / (i *12 /52) ) );
   fPMT = ( PV * Math.pow(x,N) ) / ( ( ( Math.pow(x,N) - 1 ) / (i *12 /26) ) );
   

   document.frm_calc.mPMT.value = Math.round( 100 * mPMT)/ 100;
   document.frm_calc.fPMT.value = Math.round( 100 * fPMT)/ 100;
  // document.frm_calc.wPMT.value = Math.round( 100 * wPMT)/ 100;
  
   document.frm_calc.mIOP.value = Math.round(100 * PV * i)/ 100;
  // document.frm_calc.fIOP.value = Math.round(100 * PV * i * 12 /26)/ 100;
   
}



function numbersOnly(el)
{return el.replace(/[^0-9\.]/g, "");}