function isNum( caractere ) 
{ 
var strValidos = "0123456789" 
if ( strValidos.indexOf( caractere ) == -1 ) 
return false; 
return true; 
}

function validaTeclaNum(campo, event) 
{ 
var BACKSPACE= 8; 
var key; 
var tecla; 
CheckTAB=true; 
if(navigator.appName.indexOf("Netscape")!= -1) 
tecla= event.which; 
else 
tecla = event.keyCode; 
key = String.fromCharCode( tecla); 
 //alert( 'key: ' + tecla + ' -> campo: ' + campo.value); 
 if ( tecla == 13 ) 
return false; 
if ( tecla == BACKSPACE ) 
return true; 
return ( isNum(key)); 
}

function setCookie(nome, valor)
{
   document.cookie = nome + "=" + valor;
}

function getCookie(nome)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(nome + "=");
  if (c_start!=-1)
    { 
    c_start=c_start + nome.length+1; 
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    } 
  }
return "";
}