var downStrokeField;

  function getElementsIndex (element) {
    if (element.form) {
      for (var i = 0; i < element.form.elements.length; i++) {
        if (element == element.form.elements[i]) {
          return i;
        }
      }
      return -1;  // <input type="image"> in some browsers
    }
    else {
      return -1;
    }
  }


function autojump(fieldName,nextFieldName,fakeMaxLength)
{
var myForm=document.forms[document.forms.length - 1];
var myField=myForm.elements[fieldName];
if ( getElementsIndex(myField) == myForm.elements.count) {
	return 0;
}
myField.nextField=myForm.elements[getElementsIndex(myField)+1];

if (myField.maxLength == null)
   myField.maxLength=fakeMaxLength;

myField.onkeydown=autojump_keyDown;
myField.onkeyup=autojump_keyUp;
}

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

function autojump_keyUp()
{
if (
   (this == downStrokeField) && 
   (this.value.length > this.beforeLength) && 
   (this.value.length >= this.maxLength)
   )
   {
	if (this.nextField ) {
	     if ( this.nextField.type == "text" ) {
		     this.nextField.focus();
		     this.nextField.select();
		}
	     if ( this.nextField.type == "select-one" ) {
		     this.nextField.focus();
		}
	}
   }

   downStrokeField=null;
}