function apri (URL){ 
var args=arguments; 
var w=args[1]?args[1]:280; 
var h=args[2]?args[2]:300; 
var l=args[3]?args[3]: ((screen.width-w)/2); 
var t=args[4]?args[4]: ((screen.height-h)/2); 
var s=args[5]?args[5]:'no'; 
var name=args[6]?args[6]:''; 
var f=args[7]?args[7]:'no'; 
var features ="menubar=no,toolbar=no,width="+w+",height="+h+",s  tatus=no,scrollbars="+s+",top="+t+",left="+l+",res  izable=no"; 
finestra = window.open(URL,name,features); 
if(f=='yes') 
finestra.focus() 
} 
Per la chiamata.... 
<a href="java script:apri('pagin.htm',401,425,false,false,'no')"  >