window.size = function()
{
	var w = 0;
	var h = 0;
	//IE
	if(!window.innerWidth)
	{
		//strict mode
		if(!(document.documentElement.clientWidth == 0))
		{
			w = document.documentElement.clientWidth;
			h = document.documentElement.clientHeight;
		}
		//quirks mode
		else
		{
			w = document.body.clientWidth;
			h = document.body.clientHeight;
		}
	}
	//w3c
	else
	{
		w = window.innerWidth;
		h = window.innerHeight;
	}
	return {width:w,height:h};
}

window.center = function()
{
	var hWnd = (arguments[0] != null) ? arguments[0] : {width:0,height:0};
	var _x = 0;
	var _y = 0;
	var offsetX = 0;
	var offsetY = 0;
	//IE
	if(!window.pageYOffset)
	{
		//strict mode
		if(!(document.documentElement.scrollTop == 0))
		{
			offsetY = document.documentElement.scrollTop;
			offsetX = document.documentElement.scrollLeft;
		}
		//quirks mode
		else
		{
			offsetY = document.body.scrollTop;
			offsetX = document.body.scrollLeft;
		}
	}
	//w3c
	else
	{
		offsetX = window.pageXOffset;
		offsetY = window.pageYOffset;
	}
	_x = ((this.size().width-hWnd.width)/2)+offsetX;
	_y = ((this.size().height-hWnd.height)/2)+offsetY;
	return{x:_x,y:_y};
}

function shadowClass(i)
{
	this.instance		= i;
	this.speed			= 50;
	this.divIndex 		= 10;
	this.divClassName	= 'shadow_class';
	this.divId			= 'shadow_id';
	
	this.currentOpacity = 0;
	
	this.getPageSize = function()
	{
		var xP, yP;
			
			if (window.innerHeight && window.scrollMaxY) {
				xP = window.innerWidth + window.scrollMaxX;
				yP = window.innerHeight + window.scrollMaxY;
			} else if (document.body.scrollHeight > document.body.offsetHeight) {
				xP = document.body.scrollWidth;
				yP = document.body.scrollHeight;
			} else {
				xP = document.body.offsetWidth;
				yP = document.body.offsetHeight;
			}
		
			var wW, wH;
	
			if (self.innerHeight) {
				if (document.documentElement.clientWidth) wW = document.documentElement.clientWidth;
				else wW = window.innerWidth;
				if (document.documentElement.clientHeight == (window.innerHeight - 16)) wH = document.documentElement.clientHeight;
				else wH = window.innerHeight;
			} else if (document.documentElement && document.documentElement.clientHeight) {
				wW = document.documentElement.clientWidth;
				wH = document.documentElement.clientHeight;
			} else if (document.body) {
				wW = document.body.clientWidth;
				wH = document.body.clientHeight;
			}
			
			pW = wW;
		
			if (wH < yP) pH = yP;
			else pH = wH;
	
			var rA = Array(pW, pH, wW, wH);
			return rA;
	}
	
	this.getPageScroll = function()
	{
			var xScroll = 0, yScroll = 0;

			if (typeof(window.pageYOffset) == 'number') {
				xScroll = window.pageYOffset;
				yScroll = window.pageXOffset;
			} else if (document.body && (document.body.scrollLeft || document.body.scrollTop)) {
				xScroll = document.body.scrollTop;
				yScroll = document.body.scrollLeft;
			} else if (document.documentElement && (document.documentElement.scrollLeft || document.documentElement.scrollTop)) {
				xScroll = document.documentElement.scrollTop;
				yScroll = document.documentElement.scrollLeft;
			}
			var returnArray = Array(yScroll, xScroll);
			return returnArray;
	}
	
	this.forbiddenObjects = function(v)
	{
		var s = document.getElementsByTagName('select');
		for (i = 0; i != s.length; i++) {
			s[i].style.visibility = v;
		}
		var o = document.getElementsByTagName('object');
		for (i = 0; i < o.length; i++) {
			o[i].style.visibility = v;
		}
		var e = document.getElementsByTagName('embed');
		for (i = 0; i < e.length; i++) {
			e[i].style.visibility = v;
		}
	}
	
	this.stretchPageDiv = function()
	{
		var d = document.getElementById(this.divId);
		var size	= this.getPageSize();
		var scroll	= this.getPageScroll();
		d.style.width = (size[0] + scroll[0])+ 'px';
		d.style.height = size[1] + 'px';
		//window.setTimeout( this.instance + '.stretchPageDiv()' , 200);
	}
	
	this.setAlpha = function(a)
	{
		var o = document.getElementById(this.divId);
		o.style.filter = 'alpha(opacity: ' + a + ')';
		o.style.MozOpacity = a / 100;
		o.style.KhtmlOpacity = a / 100;
		o.style.opacity = a / 100;
		o.style.background = '#000000 none repeat scroll 0%';
	}
	
	this.moveToAlpha = function(a, s)
	{
		if (a > this.currentOpacity)
		{
			this.currentOpacity += 20;
			this.setAlpha(this.currentOpacity);
			if (this.currentOpacity != a) setTimeout(this.instance + ".moveToAlpha(" + a + ", " + s + ")",s);
			else setTimeout(this.instance + '.finish()', 100);
		}
		else if (a < this.currentOpacity)
		{
			this.currentOpacity -= 20;
			this.setAlpha(this.currentOpacity);
			if (this.currentOpacity != a) setTimeout(this.instance + ".moveToAlpha(" + a + ", " + s + ")",s);
			else setTimeout(this.instance + '.finish()', 100);
		}
	}
	
	this.createPageDiv = function()
	{
		var bgDiv = document.createElement('div');
			bgDiv.style.position = 'absolute';
			bgDiv.className = this.divClassName;
			bgDiv.setAttribute('id', this.divId);
			bgDiv.style.zIndex = this.divIndex;
			bgDiv.style.left   = '0px';
			bgDiv.style.top = '0px';
			bgDiv.style.width = '0px';
			bgDiv.style.height = '0px';
			document.body.appendChild(bgDiv);
			this.stretchPageDiv();
			this.currentOpacity = 0;
			this.forbiddenObjects('hidden');
			this.moveToAlpha(80, this.speed);
			//PhotoSlice.GoToAlpha('PSbackground', backgroundAlpha, 25, 'PhotoSlice.Setup();');
	}
	
	this.finish	= function()
	{
		return false;
	}
	
	this.removePageDiv = function()
	{
		this.setAlpha(0);
		var d = document.getElementById(this.divId);
		document.body.removeChild(d);
		this.forbiddenObjects('visible');
	}

}

var shadow = new shadowClass('shadow');