count value in all cells and display result even with error in some cells

hi there.

i want to count all the values in the blue cells in my timesheet, some of them will have errors in but i still want the result even if not all of them has values in, starting at G and then every 4th cell after that, e.g G,K,O,S,
if that is possible in any way, what happens is i convert time to decimal, then al the decimal must be counted, so the decimal is in every 4th cell starting at G, but it doesnt want to display the result if not all 31 cell are filled, how can i work around this and get it to display the result like i add time.

thank you / kind regards

Hi there, for some reason my browser doesnt want to show the manage attachment screen, i do apologize for this, here is a link to it though

thank you / kind regards

http://www.4shared.com/dir/amv7gcpC/_online.html

https://www.dropbox.com/s/q80a1d47pe...esheet%206.xls

It must only count the decimal numbers. Will this work? Only every 4th column

I got it working thank you sir!

hi there sir

im finaly at home on a decent pc, i got it all working and just want to say thanks.

Thank you / Kind regards
+rep