jQuery UI Datepicker problem

Hi there,
I am actually having a quite odd problem with the jQuery Datepicker...
I've been using this datepicker for almost a year in more than 15 Java/
J2EE application, but right now I have the following problem : jQuery
doesn't want to load multiple instances in the same HTML form.
For example, I have two dates (so two input text field with different
names): Start date and End date.
<input type="text" name="strDateFrom" size="10" value=""
id="datepicker" class="textbox">
<input type="text" name="strDateTo" size="10" value="" id="datepicker"
class="textbox">
The jQuery script is the following :
*******************************************************************************************
locale = "en_US";
$(document).ready(function() {
    // French
    if(locale == 'fr_CA') {
        $.datepicker.setDefaults($.datepicker.regional['fr']);
    // English
    } else {
        $.datepicker.setDefaults($.datepicker.regional['']);
    }
    $('#datepicker').datepicker();
});
*******************************************************************************************
The JSP page loads without any error, so I launched the IE Developer
Toolbar in order to see if jQuery built the datepickers, as usual.
Here is what I see :
<INPUT class="textbox hasDatepicker" id="datepicker" size="10"
name="strDateFrom" _calId="0" jQuery1244144261442="4" value="" />
<INPUT class="textbox" id="datepicker" size="10" name="strDateTo"
value="" />
The second datepicker doesn't have the jQuery1244144261442 and _calId
attribute, which is probably the cause of my problem. But WHY? This is
really strange since I used this datepicker version for more than a
year!
Anyone has an idea?
Thank you very much
Charles Morin
CRA