// ------  Browser Detection 

isIE=false; isIE4=false; isNN=false; isNN4=false; isNN6=false; isDOM=false; isMAC=false;
if (navigator.platform.toLowerCase().indexOf('mac') != -1) isMAC = true;
if (document.all) isIE = true;
if (navigator.appVersion.toLowerCase().indexOf('msie 4') != -1) isIE4 = true;
if (navigator.appName.toLowerCase().indexOf('netscape') != -1) {
	isNN = true;
	if (parseInt(navigator.appVersion) == 4) isNN4 = true;
}
if ((isNN && !isNN4) || (isIE && !isIE4)) isDOM = true;
if (isNN && isDOM) isNN6 = true;

// ------ Environment Detection

var windowWidth; var windowHeight; var windowScrollX; var windowScrollY;
function detectEnvironmentProperties() {
	windowWidth = (isNN) ? window.innerWidth : document.body.clientWidth;
	windowHeight = (isNN) ? window.innerHeight : document.body.clientHeight;
	windowScrollX = (isNN) ? window.pageXOffset : document.body.scrollLeft;
	windowScrollY = (isNN) ? window.pageYOffset : document.body.scrollTop;
}

// ------  Url functions

function parseValueFromUrl(name) {
	var url = document.location.href;
	var value = null;
	if(url.indexOf('?') != -1) {
		var pars = url.substring(url.indexOf('?') + 1, url.length);
		if(pars.lastIndexOf('#') != -1) pars = pars.substring(0, pars.lastIndexOf('#'));
		pars = pars.split('&');
		for (i=0; i<pars.length; i++) {
			var loc = pars[i].indexOf('=');
			pName = pars[i].substring(0, loc);
			pValue = unescape(pars[i].substring(loc + 1, pars[i].length));
			if (name==pName) value = pValue;
		}
	}
	return value;
}
	
// ------  Window functions
	
function openWindow(url, name, w, h, menubar, toolbar, scrollbars) {
	var x = parseInt(screen.width / 2) - parseInt(w/2);
	var y = parseInt(screen.height / 2) - parseInt(h/2);
	var parameters = 'toolbar=0,location=0,menubar=' + menubar + ',toolbar=' + toolbar + ',scrollbars=' + scrollbars + ',width=' + w + ',height=' + h + ',top=' + y + ',left=' + x + ',screenY=' + y + ',screenX=' + x;
	var w = window.open(url, name, parameters);
	w.focus();
	return w;
}

// ------ Image functions

function toggleImage(img, oldStr, newStr) {
	img.src = img.src.replace(oldStr, newStr);
}

function replaceImage(id, oldStr, newStr) {
	document.getElementById(id).src = document.getElementById(id).src.replace(oldStr, newStr);
}

function changeImage(id, loc) {
	document.getElementById(id).src = loc;
}

function getImageLeft(img, ly) {
	(ly != null) ? layerloc = element(ly).offsetLeft : layerloc = 0;
	loc = element(img).offsetLeft;
	if (!isNN6) loc += layerloc;
	return parseInt(loc);
}

function getImageTop(img, ly) {
	(ly != null) ? layerloc = element(ly).offsetTop : layerloc = 0;
	loc = element(img).offsetTop;
	if (!isNN6) loc += layerloc;
	return parseInt(loc);
}

function cacheImages(imgList, path) {
	if (path == null) path = '';
	var images = new Array();
	for (var i=0; i<imgList.length; i++) {
		images[i] = new Image();
		images[i].src = path + imgList[i];
	}
}	

// ------ Layer functions

function showElement(id) {
	document.getElementById(id).style.display = 'block';
}

function hideElement(id) {
	document.getElementById(id).style.display = 'none';
}

function moveLayer(id, x, y) {
	document.getElementById(id).style.left = x + 'px';
	document.getElementById(id).style.top = y + 'px';
}	

// ------ String functions

function replaceChars(str, oldChar, newChar) {
	var newStr = '';
	for (var i=0; i < str.length; i++) {
		(str.charAt(i) == oldChar) ? newStr += newChar : newStr += str.charAt(i);
	}
	return newStr;
}

function toId(s) {
	var str = s.toLowerCase();
	var badChars = '\'.-+=\\\/" &';
	var newStr = '';
	for (var i=0; i<str.length; i++) {
		if (badChars.indexOf(str.charAt(i)) == -1) newStr += str.charAt(i);
	}
	return newStr;
}

function buildPath(level) {
	var path = '';
	for(var i=0; i<level; i++) {
		path += '../';
	}
	return path;
}

// ------ Layer Object

function Layer(id) {
	this.id = id;
	this.pos = new Vector();
	this.size = new Vector();
}

Layer.prototype.init = Layer_init;
Layer.prototype.hide = Layer_hide;
Layer.prototype.show = Layer_show;
Layer.prototype.move = Layer_move;
Layer.prototype.clip = Layer_clip;

function Layer_init() {
	this.pos.set(parseInt(element(this.id).offsetLeft, 10), parseInt(element(this.id).offsetTop, 10));
	this.size.set(parseInt(element(this.id).offsetWidth, 10), parseInt(element(this.id).offsetHeight, 10));
}

function Layer_hide() {
	element(this.id).style.display = 'none';
}

function Layer_show() {
	element(this.id).style.display = 'block';
}

function Layer_move(x, y) {
	moveLayer(this.id, x, y);
}

function Layer_clip(t, r, b, l) {
	element(this.id).style.clip = 'rect(' + t + 'px ' + r + 'px ' + b + 'px ' + l + 'px)';
}

// ------ Vector Object (or point)

function Vector() {
	
}

Vector.prototype.set = Vector_set;
Vector.prototype.absDistance = Vector_absDistance;

function Vector_set(x, y) {
	this.x = x;
	this.y = y;
}

function Vector_absDistance() {
	return Math.sqrt((this.x * this.x) + (this.y * this.y));;
}

function getVectorDistance(v1, v2) {
	var hDist = v1.x - v2.x;
	var vDist = v1.y - v2.y;
	var distance = Math.sqrt((hDist * hDist) + (vDist * vDist));
	return distance;
}

// ------ HyperLink Object

function HyperLink(name, url, target) {
	this.name = name;
	this.url = url;
	this.target = target;
}

// ------ Cookies

function setCookie(name, value) {
	var d = new Date(); var then = d.getTime() + (3 * 365 * 24 * 60 * 60 * 1000); d.setTime(then); d = d.toGMTString();
	document.cookie = name + "=" + escape(value) + "; expires=" + d + "; path=/";
}

function getCookie(name) {
	var value = null; var cookies = document.cookie.split('; ');
	for (var i=0; i<cookies.length; i++) {
		var loc = cookies[i].indexOf('='); var cName = cookies[i].substring(0, loc); var cValue = unescape(cookies[i].substring(loc+1, cookies[i].length));
		if (name==cName) value = cValue;
	}
	return value;
}

function deleteCookie(name) {
	var d = new Date(); var then = d.getTime() - (24 * 60 * 60 * 1000); d.setTime(then); d = d.toGMTString();
	document.cookie = name + "=-1; expires=" + d + "; path=/";
}

// ------ Other functions

function element(id) {
	var e;
	isIE4  ? e = document.all[id] : e = document.getElementById(id);
	return e; 
}