Data Combo Box Shows year ahead in IE7 - Help!

Hi,

Having some problems with a script in IE5.5-6.0 it works fine and shows the correct four digit year (once changed a xml file populates the screen) but in IE7 the combo box displays a year ahead so shows 2008 for those users only.

Any ideas where I can start, is it possible to add a function so if the useragent is IE7 it can deduct a year, Not ideal though?

The code which builds the box is:

function populateYearComboBox () {
var combo = document.getElementById ('comboNewYear');
if (!combo) return;
var offset = 5;
var d = ISODateToDate (startingDate);
var y = d.getFullYear();
var i;
for (i=y-offset;i<=y+offset;i++) {
var oOption = document.createElement ("OPTION");
oOption.text=i;
oOption.value=i;
oOption.id='year' + i;
// strange !!! you have to select the next one !!!
oOption.selected = (i == y+1);
combo.add (oOption);
}
}