// JavaScript Document - script.js

// hide/show function

function showHide(id) {
	var temp = document.getElementById(id).style;
	temp.display = (temp.display == "block" ? "none" : "block");
}


// open win

function oWin(url,winName,winW,winH) {
	var pgScroll = 1;
	var winl = (screen.width-winW)/2;
	var wint = (screen.height-winH)/2;
	var settings ='height='+winH+',';
	settings +='width='+winW+',';
	settings +='top='+wint+',';
	settings +='left='+winl+',';
	settings +='scrollbars='+pgScroll+',';
	settings +='resizable=no';
	win=window.open(url,winName,settings);
		if (parseInt(navigator.appVersion) >= 4) {
			win.window.focus();
		}
}

 // this function is needed to work around 
 // a bug in IE related to element attributes
 function hasClass(obj) {
    var result = false;
    if (obj.getAttributeNode("class") != null) {
        result = obj.getAttributeNode("class").value;
    }
    return result;
 }   

function stripe(id) {

   // the flag we'll use to keep track of 
   // whether the current row is odd or even
   var even = false;

   // if arguments are provided to specify the colours
   // of the even & odd rows, then use the them;
   // otherwise use the following defaults:
   var evenColor = arguments[1] ? arguments[1] : "#fff";
   var oddColor = arguments[2] ? arguments[2] : "#eee";

   // obtain a reference to the desired table
   // if no such table exists, abort
   var table = document.getElementById(id);
   if (! table) { return; }

   // by definition, tables can have more than one tbody
   // element, so we'll have to get the list of child
   // <tbody>s 
   var tbodies = table.getElementsByTagName("tbody");

   // and iterate through them...
   for (var h = 0; h < tbodies.length; h++) {

    // find all the &lt;tr&gt; elements... 
     var trs = tbodies[h].getElementsByTagName("tr");

     // ... and iterate through them
     for (var i = 0; i < trs.length; i++) {

       // avoid rows that have a class attribute
       // or backgroundColor style
       if (! hasClass(trs[i]) &&
           ! trs[i].style.backgroundColor) {

         // get all the cells in this row...
         var tds = trs[i].getElementsByTagName("td");

         // and iterate through them...
         for (var j = 0; j < tds.length; j++) {

           var mytd = tds[j];

           // avoid cells that have a class attribute
           // or backgroundColor style
           if (! hasClass(mytd) &&
               ! mytd.style.backgroundColor) {

             mytd.style.backgroundColor =
               even ? evenColor : oddColor;

           }
         }
       }
       // flip from odd to even, or vice-versa
       even =  ! even;
     }
   }
 }



//

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);
}