function PopUp(urlPagina,nomeWindow,wWindow,hWindow,scroll){ // by Ultima v1.2 
var win = null;
Left = (screen.width) ? (screen.width-wWindow)/2 : 0;
Top = (screen.height) ? (screen.height-hWindow)/2 : 0;
settings = 'height='+hWindow+',width='+wWindow+',top='+Top+',left='+Left+',scrollbars='+scroll+''
win = window.open(urlPagina,nomeWindow,settings)
if(win.window.focus){win.window.focus();}
}