// (c) 2006 conscious.co.uk

function calcvanbenefit() {
// Calculate fuel costs from number of miles driven, price of a litre and miles per gallon

   var formnames = new Array("privateuse", "overfour");
   var formvals = new Array();


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

      if (formvals['privateuse'] == "No") var vanbenefit = '0'; // Only company van benefit on vans in private usage
      else if (formvals['overfour'] == "Yes") var vanbenefit = '350.00'; // 350 pounds benefit if over four years old
      else var vanbenefit = '500.00'; // 500 pounds benefit if under four years old
	
   // output values
      for (j=0,m=document.vanbenefitform.elements.length;j<m;j++)
         if (document.vanbenefitform.elements[j].name == 'vanbenefit')
            document.vanbenefitform.elements[j].value = vanbenefit;	
}