Need a Simple Macro to Create Summary Sheet

In Excel 2003, I have a workbook which will contain an unknown number of sheets. I need the macro to go through each sheet and pull data to a summary sheet. There could be an unknown number of sheets so it will need to look to see how many to end.
DETAILS
The summary sheet is always Sheet1, named "Summary" and the template already will contain the titles in Row 1
The data I need to pull from each worksheet to the summary sheet will always be in A3:E3 and cell K12 of the worksheets
The summary sheet should pull the data in the detail sheets to rows in the summary sheet, consecutively, 1 row per detail sheet. In my example, WK1's information should appear in Row 2 of the Summary Sheet. WK2's info should appear in Row 3 and so on.
The detail worksheets will be named differently each time
The macro should look through the sheets to end when no more sheets exist stop pulling the data.

I have attached a sample file. My Excel workbook could contain problems since I've tried to use so many codes in it so it is just so you can get a sense of what I'm trying to do.

Please help. Thank you.