Exporting Data From Excel Into Sql Server - Newbie

Using SQL Server 2005 Standard

The basic question
What is the best way to export data from an excel spreadsheet into a sql server table?
My Application
Getting data indicating hours worked from employee timesheets into a centralised DB, then running analysis reports on it.
The columns and datatypes in the excel sheet are as follows:
Week (int) | EmployeeID (int) | JobNum (int) | ActivityNum (int) | Hours (int)

There will be a new excel file each week that, once the employee has filled out the data, would need to be saved and exported to the sql table. The columns in the sql table are exactly the same as the excel table with the addition of a RecordID primary key column.

Can I create a macro button that they can push when they have completed their timesheet OR would it be better to tell the employees to save copies of their timesheets in a certain folder on the company network and then run a batch on all the files in the folder at the end of the day?

Or is there another more efficient solution? Would I use SSIS for this or something else?

I've never used SSIS before and am a newbie at SQL Server too.

Thanks for any help you can give me.