function openpopup(pagina,w,h,scroll) 
 	 { 
 	 	 scroll = scroll || "no"; 
 	 	 var wh = 'width=' +w+ ',height=' +h+ ',scrollbars='+scroll; 
 	 	 javascript:window.open(pagina,'',wh); 
  	 	 void( 0 ); 
 	 }