<!--
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->

function valDon(frm)
{
	var errtxt='';
	
}

var the_tax_rate=22;
function changeRate(rate){
	if(rate=="40"){
	the_tax_rate=40;
	}else{
	the_tax_rate=22;
	}
}
function calculate(){
//alert(the_tax_rate);
//check a value has been entered, and if so, that it is numeric
if (document.calculator.gift.value.length <1){
alert('Please enter a donation amount.');
return false
}
if (isNaN(document.calculator.gift.value)){
alert('Please enter a valid donation amount.');
return false
}
var gift=document.calculator.gift.value;
gift=parseInt(gift);
var total;
var selfReturn;
var netgift;
//if 22% tax rate
if (the_tax_rate=="22"){
total=(gift*(100/78))*100;
document.calculator.self.value="";
document.calculator.net.value="";
}
//if 40% tax rate
else{
total=(gift*(100/78)*100);
selfReturn=(0.18*total)/100;
netgift=gift-selfReturn;
//net gift is the overall cost to the donor
selfReturn=selfReturn*100;
selfReturn=Math.round(selfReturn).toString();
//decimalise selfReturn figure
selfPounds = selfReturn.substring(0, selfReturn.length-2);
selfPence = selfReturn.substring(selfReturn.length-2, selfReturn.length);
selfReturn = selfPounds + "." + selfPence;
//decimalise netgift figure
netgift=netgift*100;
netgift=Math.round(netgift).toString();
netPounds = netgift.substring(0, netgift.length-2);
netPence = netgift.substring(netgift.length-2, netgift.length);
netgift = netPounds + "." + netPence;
document.calculator.self.value=selfReturn;
document.calculator.net.value=netgift;
}
//total is the amount NDCS get when gift aid is included
total=Math.round(total).toString();
//decimalise total figure
totPounds = total.substring(0, total.length-2);
totPence = total.substring(total.length-2, total.length);
total = totPounds + "." + totPence;
document.calculator.for_audmed.value=total;
if(gift==0){
document.calculator.self.value="";
document.calculator.net.value="";
document.calculator.for_audmed.value="";
}
return false;
}