var power_tools = ['search_share', 'calendar'];
var xmlns_html = 'http://www.w3.org/1999/xhtml';

function blur_field(field, placeholder) {
	if (field.value == '' || field.value == placeholder) {
		field.value = placeholder;
		field.className = 'placeholder';
	}
}

function bouncer(url) {
	var birthday;
	var entry = prompt('Please enter your birth date (MM/DD/YYYY).  You must be 21 years old to participate.', '');
	var minAge = 662695445000;  // Are you 662,695,445,000 milliseconds old?  Can I see proof?
	var now = new Date().valueOf();

	if (entry) {
		try {
			birthday = new Date(entry);
		}
		catch(e) {alert(e);}
	}

	if (birthday && (now - birthday.valueOf() >= minAge))
		document.location.href = url;
	else
		alert('Sorry, you must be 21 years old to participate.');

	return false;
}

function click_tool_tab(tab) {
	var id = tab.id;
	for (var i = 0; i < power_tools.length; ++i) {
		var name = power_tools[i];
		var img = document.getElementById(name + '_img');
		var src = img.src;
		var tab = document.getElementById(name);
		var tool = document.getElementById(name + '_tool');

		if (name == id) {
			tool.className = 'selected power-tool';
			img.src = src.substring(0, src.lastIndexOf('_over')) + '_selected_over' + src.substring(src.lastIndexOf('.'));
		}
		else {
			var selected_index = img.src.lastIndexOf('_selected');
			tool.className = 'power-tool';

			if (selected_index >= 0)
				img.src = src.substring(0, selected_index) + src.substring(src.lastIndexOf('.'));
		}
	}
	return false;
}

// an 85-line function because Internet Explorer can't get <object> right ... Jesus.
function embed(element_id, activeXName, attributes, params) {
	var allAttributes;
	var alt = document.getElementById(element_id + '_alt');
	var attributesActiveX = {classid: attributes.classid, codebase: attributes.codebase};
	var attributesEither = {height: attributes.height, id: element_id, width: attributes.width};
	var attributesPlugin = {data: attributes.data, type: attributes.type};
	var ns = document.createElementNS;
	var plugin;
	var replacement;
	var self = document.getElementById(element_id);

	if (navigator.plugins) {
		var plugins = navigator.plugins;
		var type = attributesPlugin.type;

		for (var i = 0; !plugin && i < navigator.plugins.length; ++i) {
			var a_plugin = plugins[i];

			for (var j = 0; !plugin && j < a_plugin.length; ++j) {
				if (a_plugin[j].type == type)
					plugin = a_plugin;
			}
		}

		if (plugin) {
			var replacement = ns ? document.createElementNS(xmlns_html, 'object') : document.createElement('object');
			allAttributes = [attributesEither, attributesPlugin];
		
			for (var i = 0; i < allAttributes.length; ++i) {
				var attributes = allAttributes[i];
		
				for (var name in attributes) {
					var value = attributes[name];
					if (value != undefined)
						replacement[name] = value;
				}
			}

			for (var name in params) {
				var param = ns ? document.createElementNS(xmlns_html, 'param') : document.createElement('param');
				param.name = name;
				param.value = params[name];
				replacement.appendChild(param);
			}

			self.parentNode.replaceChild(replacement, self);
		}
	}

	if (!plugin) {
		try {
			plugin = new ActiveXObject(activeXName);
		} catch (e) {}

		if (plugin) {
			allAttributes = [attributesEither, attributesActiveX];

			replacement = '<object';
			for (var i = 0; i < allAttributes.length; ++i) {
				var attributes = allAttributes[i];
				for (var name in attributes) {
					var value = attributes[name];
					if (value != undefined)
						replacement += ' ' + name + "='" + value + "'";
				}
			}
			replacement += '>';
			for (var name in params)
				replacement += "<param name='" + name + "' value='" + params[name] + "' />";
			replacement += '</object>';

			self.outerHTML = replacement;
		}
	}

	if (plugin) {
		if (alt)
			alt.parentNode.removeChild(alt);
	}
	else
		self.parentNode.removeChild(self);

	return document.getElementById(element_id);
}

function embed_flash(element_id, data, height, width, more_params) {
	var params = {movie: data};

	update(params, more_params);
	return embed(element_id, 'ShockwaveFlash.ShockwaveFlash', {
		classid: 'clsid:d27cdb6e-ae6d-11cf-96b8-444553540000',
		codebase: 'http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=8,0,0,0',
		data: data,
		height: height,
		type: 'application/x-shockwave-flash',
		width: width}, params);
}

function embed_quicktime(element_id, data, height, width, more_params) {
	var params = {src: data};

	update(params, more_params);
	return embed(element_id, 'QuickTimeCheckObject.QuickTimeCheck', {
		classid: 'clsid:02bf25d5-8c17-4b23-bc80-d3488abddc6b',
		codebase: 'http://www.apple.com/qtactivex/qtplugin.cab',
		data: data,
		height: height,
		type: 'video/quicktime',
		width: width}, params);
}

function focus_field(field) {
	if (field.className == 'placeholder') {
		field.className = '';
		field.value = '';
	}
}

function mouse_out_img(img) {
	if (img) {
		var src = img.src;
		img.src = src.substring(0, src.lastIndexOf('_over')) + src.substring(src.lastIndexOf('.'));
	}
}

function mouse_out_menu(menu) {
	var id = menu.id;
	var menu_items = document.getElementById(id + '_menu');

	mouse_out_img(document.getElementById(id + '_img'));
	if (menu_items)
		mouse_out_menu_items(menu_items);
}

function mouse_out_menu_items(menu_items) {
	menu_items.style.visibility = 'hidden';
}

function mouse_out_tool_tab(tool_tab) {
	var id = tool_tab.id;

	mouse_out_img(document.getElementById(id + '_img'));
}

function mouse_over_img(img) {
	if (img) {
		var src = img.src;
		var dot = src.lastIndexOf('.');
		var extension = src.substring(dot);
		img.src = src.substring(0, dot) + '_over' + extension;
	}
}

function mouse_over_menu(menu) {
	var id = menu.id;
	var menu_items = document.getElementById(id + '_menu');

	mouse_over_img(document.getElementById(id + '_img'));
	if (menu_items)
		menu_items.style.visibility='visible';
}

function mouse_over_menu_items(menu_items) {
	menu_items.style.visibility = 'visible';
}

function mouse_over_tool_tab(tool_tab) {
	var id = tool_tab.id;

	mouse_over_img(document.getElementById(id + '_img'));
}


function print_page() {
	window.print();
	return false;
}

function show_permalink() {
	var permalink = document.getElementById('permalink');
	if (permalink.style.display == 'block')
		permalink.style.display = 'none';
	else
		permalink.style.display = 'block';
	return false;
}

function update(object, properties) {
	for (var key in properties)
		object[key] = properties[key];
}