How to get the real value of a selected element

[eluser]Unknown[/eluser]
Hi all, I was trying to get a value from a select tag html but I couldn't get what i want; I got 0 in my final output:
Here is the codes:
<?php echo $year .' :'.form_dropdown($year, $years).br();?> (it's the view)

$data['year']='Year';
$data['years']=array('2007'=>'2007',
'2008'=>'2008',
'2009'=>'2009');
( the model)

I hope someone could help me to sort it out!

My kind regards!

Ranaivo