var isIE;

function init()
{
   
   if(window.navigator.appName.indexOf("Internet Explorer") == -1)
      isIE = false;
   else
      isIE = true;
   return true;
}

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);
}