function preload() {
	image_list = new Array();
	image_list[0] = 'buttons/button_bg_hover_narrow.png';
	image_list[1] = 'buttons/button_bg_hover.png';
	image_list[2] = 'buttons/button_bg_hover_wide.png';
	image_list[3] = 'buttons/button_bg_hover_ewide.png';
	image_list[4] = 'buttons/button_bg_hover_eewide.png';
	image_list[5] = 'wheelchair_hover.png';
	
	for (i=0; i<image_list.length; i++) {
		img = new Image();
		img.src = "https://www.radarkey.org/images/" + image_list[i];
	}
}

function change_img(id,img_src) {
	document.getElementById(id).src = img_src;
}

function clean(id) {
	value = document.getElementById(id).value;
	clean_value = value.replace(/[^0-9]/g, '');
	document.getElementById(id).style.color = 'black'; 
	document.getElementById(id).value = clean_value;
}

function text_clean(id) {
	document.getElementById(id).style.backgroundColor = '';
//	document.getElementById(id + '_img').src = 'images/blank.png';
	value = document.getElementById(id).value;
	clean_value = value.replace(/[^0-9a-zA-Z,. \-\&]/g, '');
	document.getElementById(id).value = clean_value;
}

function check(e,id,next_id,acc) {
	if(e.keyCode === 13){
		if (id != '') {
			value = document.getElementById(id).value;
			img = id + '_img';
			if (value == '') {
				if (acc == 'true') {
					document.getElementById(id).style.backgroundColor = 'red';
				} else {
					document.getElementById(img).src = 'images/cross.png';
				}
			} else {
				if (acc != 'true') {
					document.getElementById(img).src = 'images/tick.png';
				}
			}
		}
		setTimeout(function() { document.getElementById(next_id).focus(); }, 10);
	}
}

function change_value(id,from_value,to_value) {
	tocheck = document.getElementById(id).value
	if (tocheck === from_value) {
		document.getElementById(id).value = to_value;
		document.getElementById(id).style.color = 'black';
	}
}

function change_img(id,new_image) {
	document.getElementById(id).style.backgroundImage = '../imgs/' + new_image;
}

function change_color(id) {
	document.getElementById(id).style.backgroundColor = 'white';
}

function validate(more, original) {
	value = document.getElementById(more).value;
	value = value.trim;
	value = value.replace(/[^0-9]/g, '');
	
	if ((value != '') && (value != original)) {
		return true;
	} else {
		return false;
	}
}

function complete_validation(acc,com) {
	document.getElementById('buy_error').style.display = 'none';
	document.getElementById('error').style.display = 'none';
	
	fail_list = new Array();
	l = 0;
	valid = true;
	tocheck = new Array(5);
	tocheck[0] = 'fname';
	tocheck[1] = 'lname';
	tocheck[2] = 'address1';
	tocheck[3] = 'address2';
	tocheck[4] = 'town';


	for (i=0; i<tocheck.length; i++) {
		box_name = tocheck[i];
		document.getElementById(box_name).style.backgroundColor = '';
		
		tocheck_value = document.getElementById(box_name).value;
		tocheck_value.replace(/[^0-9a-zA-Z,. ]/g, '');
		tocheck_value.trim;
		document.getElementById(box_name).value = tocheck_value;
		
		if (tocheck_value == '') {
			valid = false;
			fail_list[l] = box_name; l++;
		}
	}
	
	tocheck_value = document.getElementById('county').value;
	tocheck_value.replace(/[^0-9a-zA-Z,. ]/g, '');
	tocheck_value.trim;
	document.getElementById('county').value = tocheck_value;
	document.getElementById('county').style.backgroundColor = '';

	document.getElementById('email').style.color = ''; 
	email = document.getElementById('email').value;
	email.trim;
	if (email != '') {
		var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,63})$/;
		if (reg.test(email) !== true) {
			valid = false;
			fail_list[l] = 'email'; l++;
		}
	} 
	
	invoice_visible = document.getElementById('address_invoice').style.display;
	if (invoice_visible == 'inline') {
		invoice_tocheck = new Array(3);
		invoice_tocheck[0] = 'invoice_address1';
		invoice_tocheck[1] = 'invoice_address2';
		invoice_tocheck[2] = 'invoice_town';
		
		for (i=0; i<invoice_tocheck.length; i++) {
			invoice_box_name = invoice_tocheck[i];
			document.getElementById(invoice_box_name).style.backgroundColor = '';
			tocheck_value = document.getElementById(invoice_box_name).value;
			tocheck_value.replace(/[^0-9a-zA-Z,. ]/g, '');
			tocheck_value.trim;
			document.getElementById(invoice_box_name).value = tocheck_value;
			
			if (tocheck_value == '') {
				valid = false;
				fail_list[l] = invoice_box_name; l++;
			}
		}
	}

	country = document.getElementById('delivery_country').value;
	if ((country == 'United Kingdom (Mainland)') || 
		(country == 'United Kingdom (Offshore Islands)') || 
		(country == 'United Kingdom (Channel Islands)') || 
		(country == 'Northern Ireland') || 
		(country == 'Ireland (Republic)')
	) {
		
		if (country == 'Ireland (Republic)') {
			var reg = /^[AC-Y]{1}[0-9]{1}[0-9W]{1}[ \-]?[0-9AC-Y]{4}$/
			var split_position = 4;
		} else {
			var reg = /^(\b[A-Za-z]{1,2}[0-9][A-Za-z0-9]? [0-9][ABD-HJLNP-UW-Zabd-hjlnp-uw-z]{2}\b)$/;
			var split_position = 3;
		}
		
		old_postcode = document.getElementById('postcode').value;
		old_postcode.trim;
		old_postcode.toUpperCase();
		old_postcode = old_postcode.replace(/ /g, '');
		
		rev_postcode = old_postcode.split("").reverse().join("");
		new_postcode = rev_postcode.substring(0, split_position) + ' ' + rev_postcode.substring(split_position);
		postcode 	 = new_postcode.split("").reverse().join("");
		document.getElementById('postcode').value = postcode;
		
		document.getElementById('postcode').style.backgroundColor = '';
		if (reg.test(postcode) !== true) {
			valid = false;
			fail_list[l] = 'postcode'; l++;
		}
		
		if (invoice_visible == 'inline') {
			document.getElementById('invoice_postcode').style.backgroundColor = '';
			old_invoice_postcode = document.getElementById('invoice_postcode').value;
			old_invoice_postcode.trim;
			old_invoice_postcode = old_invoice_postcode.replace(/ /g, '');
			old_invoice_postcode.toUpperCase();
			
			rev_invoice_postcode = old_invoice_postcode.split("").reverse().join("");
			new_invoice_postcode = rev_invoice_postcode.substring(0, split_position) + ' ' + rev_invoice_postcode.substring(split_position);
			invoice_postcode 	 = new_invoice_postcode.split("").reverse().join("");
		
			document.getElementById('invoice_postcode').value = invoice_postcode;
			if (reg.test(invoice_postcode) !== true) {
				valid = false;
				fail_list[l] = 'invoice_postcode'; l++;
			}
		}
		
		
	} 
	
	ivalid = false;
	j = 0;
	id_list = new Array();
	var key_count = 0;
	var boxes = document.getElementsByTagName("input");
	for(var i = 0; i < boxes.length; i++) {
		if(boxes[i].type == 'text') {
			box_name = boxes[i].name;
			box_id = boxes[i].id;
			if (box_name.substring(0,7) == 'item_id') {
				var key_group_list = ["1", "6", "8"];				
				item_group_part1 = box_name.substring(8);
				item_group_part2 = item_group_part1.split(']');
				item_group = item_group_part2[0];
				
				id_list[j] = box_id;
				j++;
				if (boxes[i].value != '0') {
					ivalid = true;
					if (key_group_list.indexOf(item_group) > -1) {
						num_keys = parseInt(boxes[i].value);
						key_count += num_keys;
					}
				}
			}
		};
	};
	
	company = document.getElementById('company').value;
	company.replace(/[^0-9a-zA-Z,. ]/g, '');
	company.trim;
	document.getElementById('company').value = company;
	document.getElementById('company').style.backgroundColor = '';
	if ((key_count > 9) && (company == '')) {
		valid = false;
		fail_list[l] = 'company'; l++;
	}
	
	
	if ((valid !== true) || (ivalid !== true)) {
		if (ivalid !== true) {
			document.getElementById('buy_error').style.display = 'block';
			for (k=0; k < id_list.length; k++) {
				document.getElementById(id_list[k]).style.backgroundColor = 'red';
			}
		}
		if (valid !== true) {
			document.getElementById('error').style.display = 'block';
			for (l=0; l < fail_list.length; l++) {
				document.getElementById(fail_list[l]).style.backgroundColor = 'red';
			}
		}
		window.scrollTo(0, 280);
		return false;
	} else {return true;}
}


function email_clean(id) {
	value = document.getElementById(id).value;
	clean_value = value.replace(/[^0-9a-zA-Z,._\-\.\@]/g, '');
	document.getElementById(id).value = clean_value;
}

function po_clean(id) {
	value = document.getElementById(id).value;
	clean_value = value.replace(/[^0-9a-zA-Z,._\-\.\/ ]/g, '');
	document.getElementById(id).value = clean_value;
}

function check_email(acc) {
	document.getElementById('you_email').style.backgroundColor = '';
	document.getElementById('you_email_img').src = 'images/blank.png';
	email = document.getElementById('you_email').value;
	email.trim;
	
	if (email != '') {
		var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,63})$/;
		if (reg.test(email) !== true) {
			if (acc == 'true') {
				document.getElementById('you_email').style.backgroundColor = 'red';
			} else {
				document.getElementById('you_email_img').src = 'images/cross.png';
			}
			return false;
		} else {
			document.getElementById('you_email_img').src = 'images/tick.png';
			return true;
		}
	}
}

function check_postcode(acc) {
	fail = false;
	postcode = document.getElementById('delivery_postcode').value;
	postcode.trim;
	postcode.toUpperCase();
	
	document.getElementById('delivery_postcode').value = postcode;
	
	var reg = /^(\b[A-Za-z]{1,2}[0-9][A-Za-z0-9]? [0-9][ABD-HJLNP-UW-Zabd-hjlnp-uw-z]{2}\b)$/;
	if (reg.test(postcode) !== true) {
		if (acc == 'true') {
			document.getElementById('delivery_postcode').style.backgroundColor = 'red';
		} else {
			document.getElementById('delivery_postcode_img').src = 'images/cross.png';
		}
		return false;
	} else {
		document.getElementById('delivery_postcode_img').src = 'images/tick.png';
		return true;
	}
}

function vat_check(more_box, default_value) {
	value = document.getElementById(more_box).innerHTML;
	if ((value === default_value) || (value === '')) {
		document.getElementById(more_box).style.backgroundColor = 'red';
		document.getElementById(more_box).style.color = 'black';
		return false;
	} 
}

function short_clean(id) {
	value = document.getElementById(id).value;
	clean_value = value.replace(/[^0-9a-zA-Z]/g, '');
	document.getElementById(id).value = clean_value;
}

function options_hide(qty_box) {
	document.getElementById(qty_box).style.display = 'none';
}

function show(toshow) {
	if (document.getElementById(toshow).style.display == 'none') {
		document.getElementById(toshow).style.display = 'inline';
		document.getElementById(toshow).disabled = '';
	} else {
		document.getElementById(toshow).style.display = 'none';
		document.getElementById(toshow).disabled = 'true';
	}
}

function show_locks(prod_id) {
	document.getElementById('show_locks').style.display 	= 'none';
	document.getElementById('prices_locks').style.display 	= 'block';
	if (prod_id) {
		lock_id = 'prod_' + prod_id;
		height_to_move = document.getElementById(lock_id).offsetTop;
		window.scroll(0, height_to_move);
	}
}

function show_locks_order() {
	document.getElementById('show_locks').style.display 	= 'none';
	document.getElementById('prices_locks').style.display 	= 'block';
}

function show_invoice() {
	toshow = 'address_invoice';
	but_name = 'invoice_button'
	if (document.getElementById(toshow).style.display == 'none') {
		document.getElementById(toshow).style.display = 'block';
		document.getElementById(toshow).disabled = '';
		document.getElementById(but_name).innerHTML = 'Click if invoice address is the same';
	} else {
		document.getElementById(toshow).style.display = 'none';
		document.getElementById(toshow).disabled = 'true';
		document.getElementById(but_name).innerHTML = 'Click if invoice address is different';
	}
}

function qty_change(select_box, qty_box) {
	if (document.getElementById(select_box).value != '') {
		document.getElementById(qty_box).value = '1';
		document.getElementById(qty_box).style.display = 'inline';
	}
}

function movePage(form_name) {
	height_to_move = document.getElementById(form_name).offsetTop;
	window.scroll(0, height_to_move);
}