elasped time between to dates

[Trudy Nielsen]

Having an table with a timestamp field. I want to find out how long an item has been posted compared to today's date.

$result=mysql_query("SELECT posted FROM loads ");
while ($field=mysql_fetch_row($result)) {
$posted=$field[0];

$posted is a timestamp
ie: 20050422121340

$today

I need an example of the code. ie, posted 1 hour 30 min for example.

any help would be greatly appreicated.