//funciones dinamicas varias

//* * * * * * Cambia el focus() al llenar varias cajitas de texto * * * * * * * 
var downStrokeField;
function autojump( fieldName, nextFieldName, fakeMaxLength )
{
  var myForm=document.forms[document.forms.length - 1];
  var myField=myForm.elements[fieldName];
  myField.nextField=myForm.elements[nextFieldName];
  if (myField.maxLength == null)
    myField.maxLength=fakeMaxLength;
  myField.onkeydown=autojump_keyDown;
  myField.onkeyup=autojump_keyUp;
}//fin autojump

function autojump_keyDown()
{
  this.beforeLength=this.value.length;
  downStrokeField=this;
}//fin autojump_keyDown

function autojump_keyUp()
{
  if (
    (this == downStrokeField) && 
    (this.value.length > this.beforeLength) && 
    (this.value.length >= this.maxLength)
  )
  this.nextField.focus();
  downStrokeField=null;
}//fin autojump_keyUp

//* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *