var eBox, eImg, eDesc, eNavLeft,eNavRight, eLoading;
var w,h;
var t;
var lbSpeed = 30;
var images = [];
function hideLb()
	{
	eBox.style.display = 'none';
	eBg.style.display = 'none';
	}
function animLb(e,dest, after)
	{
	var d,r;
	if(!this.lastTime)
		{
		d = new Date();
		this.lastTime = d.getTime(); 
		}
	step = 0.1;
	clearTimeout(t);
	if (Math.abs(dest-e.opa) > step)
		{
		if(dest == 0)
			e.opa -= step;
		else
			e.opa += step;
		e.style.opacity = e.opa;
		e.style.filter = 'Alpha(Opacity='+(e.opa*100)+')';
		d = new Date();
		r = d.getTime() - this.lastTime;
		if(r > lbSpeed)
			r = lbSpeed;
		t = setTimeout(function(){return animLb(e,dest,after);},lbSpeed-r);
		this.lastTime = d.getTime();
		}
	else
		{
		this.lastTime = 0;
		e.style.opa = e.style.opacity = dest;
		e.style.filter = 'Alpha(Opacity='+(dest*100)+')';
		if(after)
			setTimeout(after,0);
		}
	}
function showLb()
	{
	var tmp = new Image();
	tmp.src = eImg.src;
	eImg.width = tmp.width;
	eImg.height = tmp.height;
	eBox.opa = eBox.style.opacity = 0;
	eBg.opa = eBg.style.opacity = 0.6;
	eBg.style.filter = 'Alpha(Opacity='+(eBg.opa*100)+')';
	eBox.style.filter = 'Alpha(Opacity='+(eBox.opa*100)+')';
	eBg.style.display = '';
	eBox.style.display = '';
	ratio = eImg.width/eImg.height;
	if(eImg.height > h-70)
		{
		eImg.height = h-70;
		eImg.width = eImg.height * ratio;
		}
	if(eImg.width > w-70)
		{
		eImg.width = w-70;
		eImg.height = eImg.width / ratio;
		}
	eNavRight.style.height = eNavLeft.style.height = eImg.height+'px';
	eNavRight.style.left = eImg.width-100+6+'px';
	eBox.width = eImg.width+12;
	eBox.height = eImg.height+12;
	eBox.style.left = ((w-eBox.width)/2)+'px';
	eBox.style.top = ((h-eBox.height)/2)+'px';
	var d = new Date();
	animLb(eBox,1);
	}
function chgLb(no)
	{
	eNavLeft.style.display = 'none';
	eNavRight.style.display = 'none';
	eLoading.style.display = 'block';
	var tmp = new Image();
	tmp.onload = function()
		{
		eLoading.style.display = 'none';
		return animLb(eBox,0,function() {return lb(no)});
		};
	tmp.src = images[no].getElementsByTagName('img')[0].src.replace('thumb','lb');
	}
function lb(no)
	{
	eImg.onload = showLb;
	eImg.src = images[no].getElementsByTagName('img')[0].src.replace('thumb','lb');
	eDesc.innerHTML = images[no].getElementsByTagName('img')[0].title;
	if(no > 0)
		{
		eNavLeft.style.display = 'block';
		eNavLeft.onclick = function() {return chgLb(no-1);};
		}
	else
		eNavLeft.style.display = 'none';
	if(no != images.length-1)
		{
		eNavRight.style.display = 'block';
		eNavRight.onclick = function(){return chgLb(no+1)};
		}
	else
		eNavRight.style.display = 'none';
	}
function initLightBox()
	{
	eBg = document.createElement('div');
	eBox = document.createElement('div');
	eImg = document.createElement('img');
	eDesc = document.createElement('div');
	eLoading = document.createElement('div');
	eNavLeft = document.createElement('a');
	eNavRight = document.createElement('a');
	eBox.style.display = eBg.style.display = 'none';
	eBox.style.position = 'fixed';
	eLoading.style.display = 'none';
	eBg.className = 'lbBg';
	eBox.className = 'lb';
	eDesc.className = 'lbDesc';
	eNavLeft.className = 'lbNavLeft';
	eNavRight.className = 'lbNavRight';
	eLoading.className = 'lbLoading';
	eImg.onclick = eBg.onclick = function() {animLb(eBox,0,hideLb);};
	eBox.appendChild(eNavLeft);
	eBox.appendChild(eNavRight);
	eBox.appendChild(eImg);
	eBox.appendChild(eDesc);
	document.getElementsByTagName('body')[0].appendChild(eLoading);
	document.getElementsByTagName('body')[0].appendChild(eBg);
	document.getElementsByTagName('body')[0].appendChild(eBox);
	var e = document.getElementsByTagName('A');
	var d = e.length;
	var i,j;
	for(i = 0, j =0; i != d; ++i)
		{
		if(e[i].className == 'galImg')
			{
			images[j] = e[i];
			e[i].onclick = new Function('lb('+j+')');
			e[i].href = '#';
			++j
			}
		}
	}