How can i get data between two dates in php?

I'm using a database to store logs, with a column "date" which holds the date it was inserted. The format of the date is "MM/DD/YY". Please can anyone suggest how I would SELECT data in between two certain dates. For example, I tried this:

$from_date = "01/01/12";
$to_date = "02/11/12";

$result = mysql_query["SELECT * FROM logs WHERE date >= " . $from_date . " AND date = " . $from_date_unix . " AND date