vid=null;
function AbreJanela(url, nome, largura, altura, scroll){
posx = (screen.width/2)-(largura/2);
posy = (screen.height/2)-(altura/2);
if(vid!=null) {
	this.vid.close();
};
vid = window.open(url, nome, "width=" + largura + ",height=" + altura + ",left="+posx+",top="+posy+",location=no,toolbar=no,menubar=no,scrollbars="+scroll+",status=no,resizable=no"); 
};