function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}


<!--
function popupcentree(page,largeur,hauteur,options)
{
var top=(screen.height-hauteur)/2;
var left=(screen.width-largeur)/2;
window.open(page,"","top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options);
}
//-->