function NovaJanela(url,w,h,sb,nome,rsz){
var top;
var left;
  if (!w||!h) {sb='no'};
  if (!w) {w=581}; 
  if (!h) {h=400};
  if (!sb) {sb='no'};
  if (nome=='img_popup') {
  	top = 20;
	left = 20;
  } else {
  	top = (screen.height-h)/2;
	left = (screen.width-w)/2;
  }
  if (!rsz) {rsz='no'};
  newWindow = window.open(url,nome,'width='+w+',height='+h+',top='+top+',left='+left+',toolbar=no,location=0,directories=0,statusbar=0,menuBar=no,scrollBars='+sb+',resizable='+rsz);
  newWindow.location.href = url;
  if (newWindow.opener == null) newWindow.opener = self;
  newWindow.focus();
}