function doMath(number)



{



 return Math.floor( number * Math.pow(10,2) )/Math.pow(10,2);



}



function calculate()



{



 	var mi 	= document.calc.IR.value / 1200;



 	var base 	= 1;



 	var mbase = 1 + mi;







 	for ( i = 0; i < document.calc.YR.value * 12; i++ )



 	{



   	base = base * mbase



	}







 	document.calc.PI.value = doMath(document.calc.LA.value * mi / ( 1 - (1/base)))



 	document.calc.MT.value = doMath(document.calc.AT.value / 12)



 	document.calc.MI.value = doMath(document.calc.AI.value / 12)



 	var dasum = document.calc.LA.value * mi / ( 1 - (1/base)) +



document.calc.AT.value / 12 +



document.calc.AI.value / 12;



 	document.calc.MP.value = doMath(dasum);



}