If I'm reading your question correctly, you are paying an hourly wage to salaried employees. Salaried employees receive a weekly wage and only in vary rare instances can that wage be adjusted. Deducting an hour here and there can subject the employees to reclassification and overtime. Since the pay is being adjusted, your bank's records would reflect this activity and that can be dangerous.
You might want to look at this site for further information.
http://www.toolkit.cch.com/text/Po5_4081.asp Sorry, this is not a "link" since I don't know how to add a "link" to a message. You'll have to type it in - I don't do technology very well.