var blankImg = "images/logos/blank.gif";
var f = 'DXImageTransform.Microsoft.AlphaImageLoader';

try {
    document.execCommand('BackgroundImageCache', false, true);
} catch(e) {}

$(document).ready(
    function() {
	$('.form-buttons').show();
	$('.noscript').hide();

	if ($.browser.msie && $.browser.version < 7) {
	    $("img[@src$='.png'],input[@src$='.png']").each(fixOnePng);
	}

	$('.e-mail').each(
	    function() {
		var text = $(this).html().split(/:/);
		var email = text[0];
		var name = '';
		if (text.length == 2) name = text[1];

		email = email.replace(/ at /, '@');
		email = email.replace(/ dot /g, '.');

		text = (name == '' ? email : name);
		$(this).html(text).wrap('<a href="mailto:' + email + '"></a>');
	    });
	$(".quick-link li:not(:last-child)").append(" | ");

	// Make sure the form data is valid

	$("#reg-form").submit(
	    function () {
		var elements = this.elements;

		// Check for required fields

		var msg = "";
		msg = checkRequired(msg, elements, 'first_name', 'First name');
		msg = checkRequired(msg, elements, 'last_name', 'Last name');
		msg = checkRequired(msg, elements, 'address1', 'Address');
		msg = checkRequired(msg, elements, 'city', 'City');
		msg = checkRequired(msg, elements, 'state', 'State');
		msg = checkRequired(msg, elements, 'zip', 'Zip code');
		msg = checkRequired(msg, elements, 'night_phone_a', 'Phone area code');
		msg = checkRequired(msg, elements, 'night_phone_b', 'Phone prefix');
		msg = checkRequired(msg, elements, 'night_phone_c', 'Phone number');
		msg = checkRequired(msg, elements, 'email', 'E-mail address');
		msg = checkRequired(msg, elements, 'swe_type', 'SWE membership type');
		msg = checkRequired(msg, elements, 'conf_amount', 'Type of conference registration');

		if (msg != '') {
		    alert(msg);
		    return false;
		}

		// Forward the field data to a page that can send the data to SWE

		var formValues = new Object();
		var element;
		for (var i = 0; i < elements.length; i++) {
		    element = elements[i];

		    if (element.type == "text" ||
			element.type == "hidden" ||
			element.type == "select-one" ||
			(element.type == "checkbox" && element.checked) ||
			(element.type == "radio" && element.checked)) {

			formValues[element.name] = element.value;
		    }
		}

		$.ajax({
		    type: "POST",
		    url: 'http://www.tigerheron.com/swe/swe.php',
		    data: formValues,
		    async: false,
		    complete: function() { }
		});

		// Now allow the form to proceed to PayPal

		return true;
	    });

	// Capture events that change the form total

	$("input[name=conf_amount]," +
	  "input[name=tour_tek]," +
	  "input[name=tour_portland_spirit]," +
	  "input[name=tour_widmer]," +
	  "input[name=lunches]," +
	  "input[name=banquets]").change(
	    function() {
		var total = 0;

		$("input[name=conf_amount]," +
		  "input[name=tour_tek]," +
		  "input[name=tour_portland_spirit]," +
		  "input[name=tour_widmer]").each(
		      function() {
			  if (this.checked) {
			      var value = parseInt(this.value.replace(/[^0-9]*/g, ''));
			      if (!isNaN(value)) total += value;
			  }
		      });

		$("input[name=lunches]").each(
		    function() {
			var value = parseInt(this.value.replace(/[^0-9]*/g, '')) * 20;
			if (!isNaN(value)) total += value;
		    });

		$("input[name=banquets]").each(
		    function() {
			var value = parseInt(this.value.replace(/[^0-9]*/g, '')) * 50;
			if (!isNaN(value)) total += value;
		    });


		$("input[name=amount]").attr('value', total);
	    });
    });


// Determine if a field with a given name exists in an array

function nameInArray(name, a)
{
    for (var i = 0; i < a.length; i++) {
	if (a[i].name == name) return i;
    }
    return -1;
}

// Determine if one radio button is checked

function radioChecked(fieldName, a)
{
    for (var i = 0; i < a.length; i++) {
	if (a[i].name == fieldName && a[i].checked) {
	    return true;
	}
    }
    return false;
}

// Check that a required field has at least some data

var savedBackgrounds = new Object();

function checkRequired(msg, elements, fieldName, description)
{
    var error = false;
    var index, field;
    if ((index = nameInArray(fieldName, elements)) != -1) {
	field = elements[index];
	var value = field.value.replace(/^\s+|\s+$/g, '') ;
	if (value == '') error = true;
	if (field.type == 'radio' && !radioChecked(fieldName, elements)) error = true;
    }
    else {
	error = true;
    }

    // Identify fields for later marking

    var fields;
    if (index != -1 && elements[index].type == 'radio') {
	fields = $("*[name=" + fieldName + "]").parent();
    }
    else {
	fields = $("*[name=" + fieldName + "]");
    }

    // Save the current background, if not already saved

    if (typeof savedBackgrounds[fieldName] == 'undefined') {
	savedBackgrounds[fieldName] = fields.css('background-color');
	if (typeof savedBackgrounds[fieldName] == 'undefined') {
	    savedBackgrounds[fieldName] = 'inherit';
	}
    }

    // Build the error message

    if (error) {
	if (msg == '') {
	    msg =
		"You haven't entered all required fields.\n" +
		"Please enter these fields:\n" +
		description + "\n";
	    $("*[name=" + fieldName + "]").get(0).focus();
	}
	else {
	    msg += description + "\n";
	}

	// Signal which fields have errors

	fields.css('background-color', '#FFEEEE');
    }

    // Reset fields that have been altered

    else {
	fields.css('background-color', savedBackgrounds[fieldName]);
    }

    return msg;
}

function filt(e, s, m)
{
    if (e.filters[f]) {
	e.filters[f].enabled = s ? true : false;
	if (s) with (e.filters[f]) { src = s; sizingMethod = m }
    }
    else if (s) e.style.filter = 'progid:'+f+'(src="'+s+'",sizingMethod="'+m+'")';
}

function fixOnePng()
{
    var bgImg = this.currentStyle.backgroundImage || this.style.backgroundImage;

    if (this.tagName == 'IMG') {
	if (this.currentStyle.width == 'auto') {
	    this.style.width = this.offsetWidth + 'px';
	}
	if ( this.currentStyle.height == 'auto') {
	    this.style.height = this.offsetHeight + 'px';
	}
	filt(this, this.src, 'scale');
	this.src = blankImg;
    }
    else if (this.tagName == 'INPUT') {
	filt(this, this.src, 'scale');
	this.src = blankImg;
    }
    else if (bgImg && bgImg != 'none') {
	if (bgImg.match(/^url[(\"']+(.*\.png)[)\"']+$/i)) {
	    var s = RegExp.$1;
	    if (this.currentStyle.width == 'auto') {
		this.style.width = this.offsetWidth + 'px';
	    }
	    if (this.currentStyle.height == 'auto') {
		this.style.height = this.offsetHeight + 'px';
	    }
	    this.style.backgroundImage = 'none';
	    filt(this, s, 'crop');
	    // IE link fix.
	    for (var n = 0; n < this.childNodes.length; n++) {
		if (this.childNodes[n].style) this.childNodes[n].style.position = 'relative';
	    }
	}
	else filt(this);
    }
}