//================================Lightbox==================================
function lightbox2(obj){	
	animacao=1;
	var h_tela = document.documentElement.offsetHeight;
	var w_tela = document.documentElement.offsetWidth;
	if(!document.getElementById('lightbox')){
		var lightbox = document.createElement('div');
		lightbox.setAttribute('id','lightbox');	
		document.body.insertBefore(lightbox, document.getElementById('principal'));
	} else {
		var lightbox = document.getElementById('lightbox');
	}
	
	lightbox.style.width = w_tela+"px";
	lightbox.style.height = h_tela+"px";
	lightbox.style.opacity=0;
	lightbox.style.filter="alpha(opacity=0)";
	lightbox.style.display="block";
	
	var i=0;
	var intervalo = window.setInterval(function (){
		if(i<=9){
			lightbox.style.opacity=i/10;
			lightbox.style.filter="alpha(opacity="+i*10+")";
			i++
		} else {    
			clearInterval(intervalo);
			obj.style.display="block";
			w_obj = obj.offsetWidth;
			h_obj = obj.offsetHeight;
			obj.style.left = "50%";
			obj.style.marginLeft = (-(w_obj/2))+"px";
			
			var rolagem = window.pageYOffset || document.documentElement.scrollTop;
			var h_site=window.innerHeight || document.documentElement.clientHeight;
			//var h_site = h_site;
			var recuo=h_obj/2;
			if(h_obj>=h_site){
				recuo=h_site/2;
			}
			//obj.style.top = "50%";
			//alert(h_site+"/"+rolagem+"/"+recuo)
			//alert((-Math.abs(((h_site/2)+rolagem)-recuo))+"px")
			obj.style.marginTop = (((h_site/2)+rolagem)-recuo)+"px";
			lightbox.style.height = h_tela+"px";
			
			animacao=0;
		}
		lightbox.onclick=function (){    
			clearInterval(intervalo);
			fecha_lightbox(obj)
		}
	},40);
}

function fecha_lightbox(obj){
	document.body.removeChild(document.getElementById("lightbox"));
	document.body.removeChild(obj);
}

//===================== Final Lightbox =========================