// (c) 2006 conscious.co.uk
function calcinheritance() {
// calculates the Inheritance tax due from a form

   
   var formnames = new Array("businessasset", "houseasset", "savingsasset", "lifeasset", "otherasset", "mortgageliability", "loansliability", "otherliability");
   var formdisplayednames = new Array("Business", "House", "Savings", "Life Policies", "Other Assets", "Mortgage", "Loans", "Other Liabilites");
   var formvals = new Array();
   var outnames = new Array("netassetsval", "subjecttoinheritancetax", "taxliability");
   var outvals = new Array();


   // get form values
   for (i=0; i<formnames.length; i++)
      for (j=0,m=document.inheritanceform.elements.length;j<m;j++)
         if (document.inheritanceform.elements[j].name == formnames[i])
            formvals[formnames[i]] = document.inheritanceform.elements[j].value;

   // Error checking
   var isvalidnum = true;
   for (j=0; j<formnames.length; j++) {
      formvals[formnames[j]] = formvals[formnames[j]].replace("£", "");
      if (formvals[formnames[j]] == "") formvals[formnames[j]] = "0";
      for (i=0; i<formvals[formnames[j]].length; i++) {
         if ((formvals[formnames[j]].charAt(i) != "0")
         && (formvals[formnames[j]].charAt(i) != ".")
         && (!parseFloat(formvals[formnames[j]].charAt(i)))) {
            isvalidnum = false;
            alert("Please enter a valid number in the "+formdisplayednames[j]+" field");
            break;

      }
   }
   }
   if (isvalidnum) {
   // Calculations
      for (i=0; i<formnames.length; i++) formvals[formnames[i]] = parseInt(formvals[formnames[i]]); //remove decimal part
      
      outvals['netassetsval'] = 0;
      
      // net assets are the sum of all assets minus the sum of all liabilities
      for (i=0; i<formnames.length; i++) {
         if (i < 5) outvals['netassetsval'] += formvals[formnames[i]];
         else outvals['netassetsval'] -= formvals[formnames[i]];
         
      }
      
      // the amount subject to inheritance tax is the net asset value minus 325,000 pounds. 
      if (outvals['netassetsval'] < 325000) outvals['subjecttoinheritancetax'] = 0;
      else outvals['subjecttoinheritancetax'] = outvals['netassetsval'] - 325000; 
      
      // the tax liability is forty percent of the amount subject to inheritance tax
      outvals['taxliability'] = ((outvals['subjecttoinheritancetax']/100)*40);   

      for (i=0; i<outnames.length; i++) outvals[outnames[i]] = poundsandpence(outvals[outnames[i]], false, true);	

   // output values
   for (i=0; i<outnames.length; i++)
      for (j=0,m=document.inheritanceform.elements.length;j<m;j++)
         if (document.inheritanceform.elements[j].name == outnames[i])
            document.inheritanceform.elements[j].value = outvals[outnames[i]];

   }
}


function poundsandpence(numnotrounded, returnasfloat, isthousands) {
// makes number conform to pounds and 2 decimal (pence) digits, with options of commas denoting thousands
var decbit = (numnotrounded.toString()).split(".");



if (!decbit[1]) var decpart = "00";
else if ((decbit[1].length) == 1) var decpart = decbit[1]+"0";
else if ((decbit[1].length) == 2) var decpart = decbit[1];
else {
// Varies to get right result - check
   var tempbit = (Math.round((decbit[0]+decbit[1].substring(0,2))+"."+(decbit[1].substring(2)))).toString();
//   if (tempbit.length == 1) tempbit = "0"+tempbit;
   var decpart = tempbit.substring((tempbit.length-2));
   decbit[0] = tempbit.substring(0, (tempbit.length-2));
//   var decpart = (decbit[1].substring(0, 2));

}

if ((!returnasfloat) && (isthousands) && (decbit[0].length > 3)) {  // add commas for thousands if appropriate
   var afterthousands = "";
   for (tocommas = 0; tocommas < (decbit[0].length / 3); tocommas++) afterthousands = ","+decbit[0].substring((decbit[0].length-((tocommas+1)*3)), (decbit[0].length-(tocommas*3)))+afterthousands;
   afterthousands = afterthousands.substring(1);

}
else afterthousands = decbit[0];

var wholebit = afterthousands+"."+decpart;

if (!returnasfloat) return wholebit;
else return parseFloat(wholebit);
}