// JavaScript Document
function validate_contact_form(form)
{
	var return_value = false;
	if(form.name.value == "")
	{
		alert("Please enter your name");
		form.name.focus();
	}
	else if(!is_email(form.email.value) && form.phone.value == "")
	{
		alert("Please enter a valid email address or telephone number");
		form.email.focus();
	}
	else
	{
		return_value = true;
	}
	return return_value;
}

function validate_newsletter_form(form)
{
	return_value = false;
	if(!is_email(form.newsletterEmail.value))
	{
		alert("Please enter a valid email address");
		form.newsletterEmail.focus();
	}
	else
	{
		return_value = true;
	}
	return return_value;
}

function is_email(str)
{
  // are regular expressions supported?
  var supported = 0;
  if (window.RegExp)
  {
    var tempStr = "a";
    var tempReg = new RegExp(tempStr);
    if (tempReg.test(tempStr)) supported = 1;
  }
  if (!supported) 
    return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
  var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
  var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$");
  return (!r1.test(str) && r2.test(str));
}

// Global variable to store image details
var newImage = document.createElement("img");
function swapImage(filename)
{
	clearImage();
	newImage = document.createElement("img");
	var img_path = filename;
	newImage.setAttribute("src", img_path);
	newImage.setAttribute("onLoad", setTimeout("insertImage()",0));
}

function clearImage()
{
	newImage = document.createElement("img");
	var holderDiv = document.getElementById('mainImageHolder');
	var oldImage = document.getElementById('mainImage');
	var removed = holderDiv.removeChild(oldImage);
}

function insertImage()
{
	var holderDiv = document.getElementById('mainImageHolder');
	var oldImage = document.getElementById('loadingImage');
	newImage.setAttribute("id", "mainImage");
	holderDiv.appendChild(newImage,oldImage);
}

function urldecode( str ) {
    // http://kevin.vanzonneveld.net
    // +   original by: Philip Peterson
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +      input by: AJ
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // %          note: info on what encoding functions to use from: http://xkr.us/articles/javascript/encode-compare/
    // *     example 1: urldecode('Kevin+van+Zonneveld%21');
    // *     returns 1: 'Kevin van Zonneveld!'
    // *     example 2: urldecode('http%3A%2F%2Fkevin.vanzonneveld.net%2F');
    // *     returns 2: 'http://kevin.vanzonneveld.net/'
    // *     example 3: urldecode('http%3A%2F%2Fwww.google.nl%2Fsearch%3Fq%3Dphp.js%26ie%3Dutf-8%26oe%3Dutf-8%26aq%3Dt%26rls%3Dcom.ubuntu%3Aen-US%3Aunofficial%26client%3Dfirefox-a');
    // *     returns 3: 'http://www.google.nl/search?q=php.js&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a'
    
    var histogram = {}, histogram_r = {}, code = 0, str_tmp = [];
    var ret = str.toString();
    
    var replacer = function(search, replace, str) {
        var tmp_arr = [];
        tmp_arr = str.split(search);
        return tmp_arr.join(replace);
    };
    
    // The histogram is identical to the one in urlencode.
    histogram['!']   = '%21';
    histogram['%20'] = '+';
    
    for (replace in histogram) {
        search = histogram[replace]; // Switch order when decoding
        ret = replacer(search, replace, ret) // Custom replace. No regexing   
    }
    
    // End with decodeURIComponent, which most resembles PHP's encoding functions
    ret = decodeURIComponent(ret);
 
    return ret;
}

function updatePrice()
{
	var form = document.getElementById("membershipForm");
	var membership = "";
	for(i=0;i<form.membership.length;i++)
	{
		if(form.membership[i].checked)
		{
			membership = form.membership[i].value;
			break;
		}
	}
	if(membership != "")
	{
		var aTmp = membership.split("|");
		form.mRate.value = aTmp[0];
		form.mExVat.value = aTmp[1];
		form.mIncVat.value = aTmp[2];
		form.mDesc.value = aTmp[3];
		
		var newSpan = document.createElement("span");
		var newText = document.createTextNode(aTmp[2]);
		newSpan.appendChild(newText);
		
		var objContainer = document.getElementById("priceHolder");
		var oldSpan = objContainer.getElementsByTagName("span").item(0);
		var replaced = objContainer.replaceChild(newSpan,oldSpan);
	}
}

function validate_membership_form(form)
{
	var return_value = false;
	
	var paymentSelected = false;
	for(i=0;i<form.payment.length;i++)
	{
		if(form.payment[i].checked)
		{
			paymentSelected = true;
			break;
		}
	}
	
	if(form.mRate.value == "" || form.mExVat.value == "" || form.mIncVat.value == "" || form.mDesc.value == "")
	{
		alert("Please select a membership option");
		form.m1.focus();
	}
	else if(form.companyName.value == "")
	{
		alert("Please enter the company name");
		form.companyName.focus();
	}
	else if(form.companyAddress.value == "")
	{
		alert("Please enter the company address");
		form.companyAddress.focus();
	}
	else if(form.companyPostcode.value == "")
	{
		alert("Please enter the company postcode");
		form.companyPostcode.focus();
	}
	else if(form.contactName.value == "")
	{
		alert("Please enter your name");
		form.contactName.focus();
	}
	else if(form.jobTitle.value == "")
	{
		alert("Please enter your job title");
		form.jobTitle.focus();
	}
	else if(form.email.value == "")
	{
		alert("Please enter your email address");
		form.email.focus();
	}
	else if(form.phone.value == "")
	{
		alert("Please enter your telephone number");
		form.phone.focus();
	}
	else if(form.employees.value == "")
	{
		alert("Please enter the number of employees");
		form.employees.focus();
	}
	else if(!paymentSelected)
	{
		alert("Please select a payment option");
		form.p1.focus();
	}
	else if(!form.confirmation.checked)
	{
		alert("Please confirm that you agree to the membership requirements and are authorised to sign on behalf of the company named");
		form.confirmation.focus();
	}
	else
	{
		return_value = true;
	}
	return return_value;
}