if (top == self) self.location.href = "bblerr.asp"; 
function eliminaCaracterInvalido(form,campo) {
   var invalido = new Array(34,39,38,124,33,63);
   for (i=0;i<invalido.length;i++) {
      for (j=0;j<document.forms[form].elements[campo].value.length;j++) {
          if (document.forms[form].elements[campo].value.charCodeAt(j)==invalido[i]) {
             document.forms[form].elements[campo].value=document.forms[form].elements[campo].value.substr(0,j)+document.forms[form].elements[campo].value.substr(++j,--document.forms[form].elements[campo].value.length);
             alert("Caracter inválido");
             return true;
          }
      }
   }
   return true;
}