function validate_form(form) {
	if (!form) form = window.event; // fix for IE
	if (form.elements["form_ignore"]) {
		return true
	} else {
		var formValid = "1"
		var reqFields = form.elements["required"].value.split(",")
		for (var i = 0; i < reqFields.length; i++) {
			if (form.elements[reqFields[i]].value == "") {
				formValid = "0"
			}
		}
		if (formValid == "0") {
			alert("All required fields must be completed")
			return false
		} else {
			return true
		}
	}
}

function validate_profile(myform) {
	if (!myform) myform = window.event; // fix for IE
	var formValid = "1"
	var theDate = "0"
	var reqFields = myform.elements["required"].value.split(",")
	for (var i = 0; i < reqFields.length; i++) {
		if (myform.elements[reqFields[i]].value == "") {
			formValid = "0"
		}
	}
	if (formValid == "0") {
		alert("All fields marked with an * must be completed")
		return false
	}
	return true
}

function validate_reg(form) {
	if (!form) form = window.event; // fix for IE
	if (form.password.value != form.password2.value) {
		alert("Please re-enter your password (the two values do not match).")
		form.password.value = ""
		form.password2.value = ""
		form.password.focus()
		form.password.select()
		return false
	}
	var formValid = "1"
	var agreeTerms = "0"
	var theDate = "0"
	var reqFields = form.elements["required"].value.split(",")
	for (var i = 0; i < reqFields.length; i++) {
		if (form.elements[reqFields[i]].value == "") {
			formValid = "0"
		}
	}
	if (form.agree_terms.checked) {
		agreeTerms = "1"
	}
	if (formValid == "0") {
		alert("All fields marked with an * must be completed")
		return false
	} else if (agreeTerms == "0") {
		alert("Please confirm you have read and agree to our Terms & Conditions by ticking the box at the bottom of the form")
		return false
	}
	return true
}

function validate_login(form) {
	if (!form) form = window.event; // fix for IE
	var formValid = "1"
	var reqFields = form.elements["required"].value.split(",")
	for (var i = 0; i < reqFields.length; i++) {
		if (form.elements[reqFields[i]].value == "") {
			formValid = "0"
		}
	}
	if (formValid == "0") {
		alert("Please enter both your email address and password")
		return false
	} else {
		return true
	}
}

function validate_poll(form) {
	if (!form) form = window.event; // fix for IE
	var formValid = "0"
	//var reqFields = form.elements["required"].value.split(",")
	for (var i = 0; i < form.r.length; i++) {
		if (form.r[i].checked) {
			formValid = "1"
		}
	}
	if (formValid == "0") {
		alert("Please choose an option to vote for!")
		return false
	} else {
		return true
	}
}

function validate_search(form) {
	if (!form) form = window.event; // fix for IE
	if ((form.search_type.options[form.search_type.selectedIndex].text == "Lifelists that contain") && (form.elements["search_terms"].value == "")) {
		alert("When searching for \"Lifelists that contain\" you must enter some search terms!")
		return false
	}
	return true
}

/*
function isEmpty(inputStr) {
	if (inputStr == "" || inputStr == null) {
		return true
	}
	return false
}

function inRange(inputStr, lo, hi) {
	var num = parseInt(inputStr, 10)
	if (num < lo || num > hi) {
		return false
	}
	return true
}

function validateDate(day, month, year) {
	if (!isEmpty(month)) {
		if ((month.length != 2) && (month.length != 0)) {
			return 2
		}
		month = parseInt(month, 10)
		if (isNaN(month)) {
			return 2
		} else {
			if (!inRange(month, 1, 12)) {
				return 2
			}
		}
	}
	if (!isEmpty(day)) {
		if ((day.length != 2) && (day.length != 0)) {
			return 1
		}
		day = parseInt(day, 10)
		if (isNaN(day)) {
			return 1
		} else {
			var monthMax = new Array(31,31,29,31,30,31,30,31,31,30,31,30,31)
			var top = monthMax[month]
			if (!inRange(day, 1, top)) {
				return 1
			}
		}
	}
	if (!isEmpty(year)) {
		if ((year.length != 4) && (year.length != 0)) {
			return 3
		}
		var year = parseInt(year, 10)
		if (isNaN(year)) {
			return 3
		} else {
			if (!inRange(year, 1900, 2006)) {
				return 3
			}
		}
	}
	return 0
}
*/

function quicklistSelect(option) {
	if (!option) option = window.event; // fix for IE
	if (option.value != "") {
		window.location = "mylifelists.php?" + option.value;
	}
}

function validateNickname(form) {
	this_object = form.n_nickname;
	new_nickname = this_object.value;
	if (form.user_id) {
		user_id = form.user_id.value;
	} else {
		user_id = 0;
	}
	if (new_nickname != "") {
		this_user_id = user_id;
		var myElement = "nickname_response";
		var elementToShow = document.getElementById(myElement);
		elementToShow.style.visibility = 'visible';
		elementToShow.style.height = 'auto';
		var the_text = "checking nickname...";
		var current_text = elementToShow.innerHTML;
		elementToShow.innerHTML = current_text + the_text;
		if (!xmlhttp) {
			xmlhttp = getXmlHttpRequest();
		}
		if (!xmlhttp) {
			alert("could not create XmlHttpRequest");
			return;
		}
		var qry = 'new_nickname=' + new_nickname + '&user_id=' + this_user_id;
		var url = 'php/validate_nickname.php';
		xmlhttp.open('POST', url, true);
		xmlhttp.onreadystatechange = printValidateNickname;
		xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		xmlhttp.send(qry);
	}
}

function printValidateNickname() {
	if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
		var myElement = 'nickname_response';
		var elementToShow = document.getElementById(myElement);
		if (xmlhttp.responseText == "false") {
			var the_text = "sorry, this nickname is already taken";
			elementToShow.innerHTML = the_text;
			elementToShow.style.visibility = 'visible';
			elementToShow.style.height = 'auto';
			this_object.focus();
			this_object.select();
		} else {
			var the_text = "";
			elementToShow.innerHTML = the_text;
			elementToShow.style.visibility = 'hidden';
			elementToShow.style.height = '0px';
		}
	} else {
		try {
			var alertStr = "xmlhttp.readyState=" + xmlhttp.readyState + " xmlhttp.status=" + xmlhttp.status;
		}
		catch (e) {
			var alertStr = "error getting xmlhttp.readyState and xmlhttp.status";
		}
	}
}

function validate_email(email) {
	if (!email) email = window.event; // fix for IE
	var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
	var address = email.value;
	if(reg.test(address) == false) {
		alert('the email address you entered does not appear to be valid!');
		email.focus();
		email.select();
		return false;
	} else {
		return true;
	}
}

function check_length(item) {
	if (item.value.length > 255) {
		item.value = item.value.substring(0,255);
	}
}

function itemNumChange(item) {

	var thisForm = item.form;
	// first we need to know if the item is moving to a higher or lower position in the list
	// so lets start by getting the 'new' and 'old' position numbers
	
	// find the 'old' value of the changed element
	var oldVal = parseInt(thisForm.elements[item.name + "_old"].value);
	// find the 'new' value of the changed element
	var newVal = parseInt(item.options[item.selectedIndex].value);
	
	// now before we deal with the rest of the list, update the hidden 'old' field for this item so subsequent changes will work
	thisForm.elements[item.name + "_old"].value = newVal;
	
	if (newVal > oldVal) {
		// we're moving the item down
		// so we have to find all the elements that are greater than or equal to the new value, and decrement them
		for (var i=0; i<thisForm.elements.length; i++) {
			if ((thisForm.elements[i].type == "select-one") && (thisForm.elements[i].name.substring(0,12) == "form_item_no") && (thisForm.elements[i] != item)) {
				// this is a select element, but not the one that was changed
				if ((parseInt(thisForm.elements[i].options[thisForm.elements[i].selectedIndex].value) <= newVal) && (parseInt(thisForm.elements[i].options[thisForm.elements[i].selectedIndex].value) >= oldVal)) {
					// this is a select element that needs it's number decrementing
					// decrement the selection of the element
					thisForm.elements[i].selectedIndex = parseInt(thisForm.elements[i].selectedIndex) - 1;
					// decrement the hidden 'old' value field
					thisForm.elements[thisForm.elements[i].name + "_old"].value = parseInt(thisForm.elements[thisForm.elements[i].name + "_old"].value) - 1;
				}
			}
		}
	} else {
		// we're moving the item up
		// so we have to find all the elements that are less than or equal to the new value, and increment them
		for (var i=0; i<thisForm.elements.length; i++) {
			if ((thisForm.elements[i].type == "select-one") && (thisForm.elements[i].name.substring(0,12) == "form_item_no") && (thisForm.elements[i] != item)) {
				// this is a select element, but not the one that was changed, so we need to check it's value
				if ((parseInt(thisForm.elements[i].options[thisForm.elements[i].selectedIndex].value) <= oldVal) && (parseInt(thisForm.elements[i].options[thisForm.elements[i].selectedIndex].value) >= newVal)) {
					// this is a select element that needs it's number incrementing
					// increment the selection of the element
					thisForm.elements[i].selectedIndex = parseInt(thisForm.elements[i].selectedIndex) + 1;
					// increment the hidden 'old' value field
					thisForm.elements[thisForm.elements[i].name + "_old"].value = parseInt(thisForm.elements[thisForm.elements[i].name + "_old"].value) + 1;
				}
			}
		}
	}
	
	// now we should hide the sort pulldown and show the reminder (and button) to save the number changes
	document.getElementById('sort_pulldown').style.visibility = 'hidden';
	document.getElementById('sort_pulldown').style.display = 'none';
	document.getElementById('numchange_reminder').style.visibility = 'visible';
	document.getElementById('numchange_reminder').style.display = 'block';
}

function chooseSort(thisSelect) {
	if (thisSelect.form.this_action != undefined) {
		var mode = thisSelect.form.this_action.value;
	} else {
		var mode = "";
	}
	var selected_list_id = thisSelect.form.selected_list_id.value;
	var selected_cat_id = thisSelect.form.selected_cat_id.value;
	var order_sort = thisSelect.options[thisSelect.selectedIndex].value;
	var split_char = order_sort.lastIndexOf("_");
	var order_by = order_sort.substring(0,split_char);
	var sort_dir = order_sort.substring(split_char+1);
	var new_href = location.protocol + "//" + location.host;
	var new_pathname = location.pathname;
	if (mode == "edit") {
		var new_action = "edit";
	} else {
		switch ( selected_cat_id ) {
			case "100":
				var new_action = "show_todo_list";
				break;
			case "200":
				var new_action = "show_picture_list";
				break;
			case "300":
				var new_action = "show_bucket_list";
				break;
			case "400":
				var new_action = "show_trivia_list";
				break;
			default:
				var new_action = "show_list";
		}
	}
	var new_url = new_href + new_pathname + "?action=" + new_action;
	new_url += "&selected_list_id=" + selected_list_id + "&selected_cat_id=" + selected_cat_id + "&order_by=" + order_by + "&sort_dir=" + sort_dir;
	//alert(new_url);
	window.location.href = new_url;
}