function Abrir(Url,Wi,He) 
{ 
   open(''+Url+'','PerNatural','width='+Wi+',height='+He+', location=NO, scrollbars=yes,toolbar=no,status=yes,resizable=yes,left=180,top=120') 
} 

function Abrir_Datos(Url,W,H) 
{ 
   datos=open(''+Url+'','PerNatural','width='+W+',height='+H+',scrollbars=no,toolbar=no,status=no,resizable=no,left=150,top=150') 
  datos.focus();
} 


//---------------------------------------------------------------------------------//

var nav4 = window.Event ? true : false;
function acceptNum(evt){ 
   // NOTE: Backspace = 8, Enter = 13, '0' = 48, '9' = 57 
   var key = nav4 ? evt.which : evt.keyCode;  
   return (key <= 13 || (key >= 48 && key <= 57));
}

//---------------------------------------------------------------------------------//