var ie = /msie/i.test(navigator.userAgent);
var ieBox = ie && (document.compatMode == null || document.compatMode == "BackCompat");

var id_obj;

function Centralizar(id,alin_vert,alin_horz) {
	
	id_obj = id;

	var obj = document.getElementById(id);

	var canvasEl = ieBox ? document.body : document.documentElement;
	
	if (alin_vert == true){
		var h = window.innerHeight || canvasEl.clientHeight;
		var top = ((h - parseInt(obj.style.height)) / 2);
		obj.style.top = top + "px";
	}

	if (alin_horz == true){
		var w = window.innerWidth || canvasEl.clientWidth;
		var esq = ((w - parseInt(obj.style.width)) / 2);
		obj.style.left = esq + "px";
	}
}