function floor(number)
{
return Math.floor(number*Math.pow(10,2))/Math.pow(10,2);
}
function dosum()
{
var mi = document.temps.IR.value / 1200;
var base = 1;
var mbase = 1 + mi;
for (i=0; i<document.temps.YR.value * 12; i++)
{
base = base * mbase
}
document.temps.PI.value = floor(document.temps.LA.value * mi / ( 1 - (1/base)))
document.temps.MT.value = floor(document.temps.AT.value / 12)
document.temps.MI.value = floor(document.temps.AI.value / 12)
var dasum = document.temps.LA.value * mi / ( 1 - (1/base)) +
document.temps.AT.value / 12 + 
document.temps.AI.value / 12;
document.temps.MP.value = floor(dasum);
}