well you need to find out what week it is in the year...in the db assign one set of value to week 1 and other to week 2
using the date feature of "W" to get the week of the year, its then a simple query to get the schedule
//get date
$weekofyear=date("W");
if ((1&$weekofyear)) {
$sql="select * from table_name where week=1";
}
if (!(1&$weekofyear)) {
$sql="select * from table_name where week=2";
}
//execute the query
you might need to change this depending on which week school started
