// JavaScript Document

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_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_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 RB_validateForm() { //v4.0
  var i,p,q,nm,test,num,min,max,errors='',args=RB_validateForm.arguments;
  for (i=0; i<(args.length-3); i+=4) { test=args[i+2]; val=MM_findObj(args[i]); disp=args[i+3]
    if (val) { nm=val.name; if ((val=val.value)!="") {
      if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
        if (p<1 || p==(val.length-1)) errors+='- '+disp+' must contain an e-mail address.\n';
      } else if (test!='R') { num = parseFloat(val);
        if (isNaN(val)) errors+='- '+disp+' must contain a number.\n';
        if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
          min=test.substring(8,p); max=test.substring(p+1);
          if (num<min || max<num) errors+='- '+disp+' must contain a number between '+min+' and '+max+'.\n';
    } } } else if (test.charAt(0) == 'R') errors += '- '+disp+' is required.\n'; }
  } if (errors) alert('The following error(s) occurred:\n'+errors);
  document.MM_returnValue = (errors == '');
}

function RB_calcCost(){
	
	v1=parseInt(document.getElementById('volume1').value);
	v2=parseInt(document.getElementById('volume2').value);
	v3=parseInt(document.getElementById('volume3').value);
	v4=parseInt(document.getElementById('volume4').value);
	
	trueCost = (v1 + v2  + v3 + v4) * 50;
	
	if (v1==0 && v2==0 && v3==0 && v4 ==0) 
	{
		subTotal = 0;
		document.getElementById('priceToPay').innerHTML='&pound;' + subTotal.toFixed(2);
		return;
	}
	
	numberOfCopies=v1+v2+v3+v4;
	
	if ( numberOfCopies > 1){
		pSingleCopy = 40;
		discount = 10 * numberOfCopies;
	} else {
		pSingleCopy = 50;
		discount = 0;
	}
	
	
	subTotal = numberOfCopies * pSingleCopy;

	totalCost = subTotal;


	
	
	//p&p cost 
	if (getSelectedRadioValue(document.forms['secpay'].shipping) == "outsideuk"){
		totalCost = totalCost + (5 * numberOfCopies);
	} else {
		totalCost = totalCost + (2.5 * numberOfCopies);
	}

	//console.debug(totalCost);
	document.getElementById('amount').value=totalCost.toFixed(2);
	document.getElementById('numVol1').value=v1;
	document.getElementById('numVol2').value=v2;
	document.getElementById('numVol3').value=v3;
	document.getElementById('numVol4').value=v4;
	document.getElementById('priceToPay').innerHTML='&pound;' + totalCost.toFixed(2);
	
	if (document.getElementById('order')){
		
		discount = trueCost - subTotal;
		
		orderFld="Volume 1,item_amount=50.00x" + v1 + ";";
		orderFld += "Volume 2,item_amount=50.00x" + v2 + ";";
		orderFld += "Volume 3,item_amount=50.00x" + v3 + ";";
		orderFld += "Volume 4,item_amount=50.00x" + v4 + ";";
		orderFld += "DISCOUNT,item_amount=" + discount.toFixed(2) + ";";
		document.getElementById('order').value=orderFld;
		
	}
}

function getSelectedRadio(buttonGroup) {
   // returns the array number of the selected radio button or -1 if no button is selected
   if (buttonGroup[0]) { // if the button group is an array (one button is not an array)
      for (var i=0; i<buttonGroup.length; i++) {
         if (buttonGroup[i].checked) {
            return i
         }
      }
   } else {
      if (buttonGroup.checked) { return 0; } // if the one button is checked, return zero
   }
   // if we get to this point, no radio button is selected
   return -1;
} // Ends the "getSelectedRadio" function

function getSelectedRadioValue(buttonGroup) {
   // returns the value of the selected radio button or "" if no button is selected
   var i = getSelectedRadio(buttonGroup);
   if (i == -1) {
      return "";
   } else {
      if (buttonGroup[i]) { // Make sure the button group is an array (not just one button)
         return buttonGroup[i].value;
      } else { // The button group is just the one button, and it is checked
         return buttonGroup.value;
      }
   }
} // Ends the "getSelectedRadioValue" function

function getSelectedCheckbox(buttonGroup) {
   // Go through all the check boxes. return an array of all the ones
   // that are selected (their position numbers). if no boxes were checked,
   // returned array will be empty (length will be zero)
   var retArr = new Array();
   var lastElement = 0;
   if (buttonGroup[0]) { // if the button group is an array (one check box is not an array)
      for (var i=0; i<buttonGroup.length; i++) {
         if (buttonGroup[i].checked) {
            retArr.length = lastElement;
            retArr[lastElement] = i;
            lastElement++;
         }
      }
   } else { // There is only one check box (it's not an array)
      if (buttonGroup.checked) { // if the one check box is checked
         retArr.length = lastElement;
         retArr[lastElement] = 0; // return zero as the only array value
      }
   }
   return retArr;
} // Ends the "getSelectedCheckbox" function

function getSelectedCheckboxValue(buttonGroup) {
   // return an array of values selected in the check box group. if no boxes
   // were checked, returned array will be empty (length will be zero)
   var retArr = new Array(); // set up empty array for the return values
   var selectedItems = getSelectedCheckbox(buttonGroup);
   if (selectedItems.length != 0) { // if there was something selected
      retArr.length = selectedItems.length;
      for (var i=0; i<selectedItems.length; i++) {
         if (buttonGroup[selectedItems[i]]) { // Make sure it's an array
            retArr[i] = buttonGroup[selectedItems[i]].value;
         } else { // It's not an array (there's just one check box and it's selected)
            retArr[i] = buttonGroup.value;// return that value
         }
      }
   }
   return retArr;
} // Ends the "getSelectedCheckBoxValue" function