function updaterready(form){
	var baseamount=form.mramount.value;
	if (form.rready.checked) {
		form.amount.value=parseInt(baseamount)+10;
		form.item_name.value="Membership Renewal "+$rvar_membno+" "+$rvar_surname+" with Racer Ready";
		}
	else {
		form.amount.value=baseamount;
		form.item_name.value="Membership Renewal "+$rvar_membno+" "+$rvar_surname;
		}
	return true;
}
function updateprice(form){
/* summer 2012
	var indprice=11;
	var junprice=5.50;
	var stuprice=6;
	var famprice=13.50;
	var faminc=1.50;
	var racerready=10;*/
	
/* winter 2011-12*/
    var indprice=22;
	var junprice=11;
	var stuprice=12;
	var famprice=27;
	var faminc=3;
	var racerready=10; 
	
	var totprice=0;
	var type=form.membtype.value;
	if (type=="Ind") {
	  totprice=indprice; 
		form.membcount.value=1;
	}
	else if (type=="Jun") {
	  totprice=junprice; 
		form.membcount.value=1;
	}
	else if (type=="Stu") {
	  totprice=stuprice; 
		form.membcount.value=1;
	}
	else if (type=="Fam") {
	   if (form.membcount.value<2)form.membcount.value=2;
	   totprice=famprice+faminc*(form.membcount.value);
	}
/*	if (form.rready.checked) totprice=totprice+racerready; */
	form.price.value=totprice;
	form.pricestring.value="Total amount £"+totprice;
  return true;
}

// ----------------------------------------------------------------------
// Javascript form validation routines.
// Author: Stephen Poley
//
// Simple routines to quickly pick up obvious typos.
// All validation routines return true if executed by an older browser:
// in this case validation must be left to the server.
//
// Update Aug 2004: have tested that IE 5.0 and IE 5.5 both support DOM model
// sufficiently well, so innerHTML option removed (redundant).
//
// Update Jun 2005: discovered that reason IE wasn't setting focus was
// due to an IE timing bug. Added 0.1 sec delay to fix.
//
// Update Oct 2005: minor tidy-up: unused parameter removed
//
// RW:  Changed error messages.  Add validatePcode.
//
// ----------------------------------------------------------------------

var nbsp = 160;    // non-breaking space char
var node_text = 3; // DOM text node-type
var emptyString = /^\s*$/
var glb_vfld;      // retain vfld for timer thread

// -----------------------------------------
//                  trim
// Trim leading/trailing whitespace off string
// -----------------------------------------

function trim(str)
{
  return str.replace(/^\s+|\s+$/g, '')
};


// -----------------------------------------
//                  setfocus
// Delayed focus setting to get around IE bug
// -----------------------------------------

function setFocusDelayed()
{
  glb_vfld.focus()
}

function setfocus(vfld)
{
  // save vfld in global variable so value retained when routine exits
  glb_vfld = vfld;
  setTimeout( 'setFocusDelayed()', 100 );
}


// -----------------------------------------
//                  msg
// Display warn/error message in HTML element
// commonCheck routine must have previously been called
// -----------------------------------------

function msg(fld,     // id of element to display message in
             msgtype, // class to give element ("warn" or "error")
             message) // string to display
{
  // setting an empty string can give problems if later set to a 
  // non-empty string, so ensure a space present. (For Mozilla and Opera one could 
  // simply use a space, but IE demands something more, like a non-breaking space.)
  var dispmessage;
  if (emptyString.test(message)) 
    dispmessage = String.fromCharCode(nbsp);    
  else  
    dispmessage = message;

  var elem = document.getElementById(fld);
  elem.firstChild.nodeValue = dispmessage;  
  
  elem.className = msgtype;   // set the CSS class to adjust appearance of message
};

// -----------------------------------------
//            commonCheck
// Common code for all validation routines to:
// (a) check for older / less-equipped browsers
// (b) check if empty fields are required
// Returns true (validation passed), 
//         false (validation failed) or 
//         proceed (don't know yet)
// -----------------------------------------

var proceed = 2;  

function commonCheck    (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(ifld);
  if (!elem.firstChild)
    return true;  // not available on this browser 
  if (elem.firstChild.nodeType != node_text)
    return true;  // ifld is wrong type of node  

  if (emptyString.test(vfld.value)) {
    if (reqd) {
      msg (ifld, "error", "Required");  
      setfocus(vfld);
      return false;
    }
    else {
      msg (ifld, "warn", "");   // OK
      return true;  
    }
  }
  return proceed;
}

// -----------------------------------------
//            validatePresent
// Validate if something has been entered
// Returns true if so 
// -----------------------------------------

function validatePresent(vfld,   // element to be validated
                         ifld )  // id of element to receive info/error msg
{
  var stat = commonCheck (vfld, ifld, true);
  if (stat != proceed) return stat;

  msg (ifld, "warn", "");  
  return true;
};

// -----------------------------------------
//               validateEmail
// Validate if e-mail address
// Returns true if so (and also if could not be executed because of old browser)
// -----------------------------------------

function validateEmail  (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);  // value of field with whitespace trimmed off
  var email = /^[^@]+@[^@.]+\.[^@]*\w\w$/
  if (!email.test(tfld)) {
    msg (ifld, "error", "Invalid");
    setfocus(vfld);
    return false;
  }

  var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/
  if (!email2.test(tfld)) 
    msg (ifld, "warn", "Valid??");
  else
    msg (ifld, "warn", "");
  return true;
};


// -----------------------------------------
//            validateTelnr
// Validate telephone number
// Returns true if so (and also if could not be executed because of old browser)
// Permits spaces, hyphens, brackets and leading +
// -----------------------------------------

function validateTelnr  (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);  // value of field with whitespace trimmed off
  var telnr = /^\+?[0-9 ()-]+[0-9]$/
  if (!telnr.test(tfld)) {
    msg (ifld, "error", "Invalid");
    setfocus(vfld);
    return false;
  }

  var numdigits = 0;
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++;

  if (numdigits<6) {
    msg (ifld, "error", "Too short");
    setfocus(vfld);
    return false;
  }

  if (numdigits<10)
    msg (ifld, "warn", "Too short?");
  else
    msg (ifld, "warn", "");

  return true;
};

function validatePcode  (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);  // value of field with whitespace trimmed off
  if (!postit(tfld)) {
    msg (ifld, "error", "Invalid");
    setfocus(vfld);
    return false;
  }
	
  msg (ifld, "error", "");
  return true;
};

function postit(pc){ //check postcode format is valid
 size = pc.length
 pc = pc.toUpperCase(); //Change to uppercase
 while (pc.slice(0,1) == " ") //Strip leading spaces
  {pc = pc.substr(1,size-1);size = pc.length
  }
 while(pc.slice(size-1,size)== " ") //Strip trailing spaces
  {pc = pc.substr(0,size-1);size = pc.length
  }
 if (size < 6 || size > 8){ //Code length rule
  return false;
  }
 if (!(isNaN(pc.charAt(0)))){ //leftmost character must be alpha character rule
      return false;
  }
 if (isNaN(pc.charAt(size-3))){ //first character of inward code must be numeric rule
    return false;
  }
 if (!(isNaN(pc.charAt(size-2)))){ //second character of inward code must be alpha rule
   return false;
  }
 if (!(isNaN(pc.charAt(size-1)))){ //third character of inward code must be alpha rule
    return false;
  }
 if (!(pc.charAt(size-4) == " ")){//space in position length-3 rule
   return false;
   }
 count1 = pc.indexOf(" ");count2 = pc.lastIndexOf(" ");
 if (count1 != count2){//only one space rule
   return false;
  }
return true;
}