JSF Command Button and Command Links

The main page of my JSF application has a Save button and Command Links. After making any changes on the main page the user should click Save before using any of the Links. Most of the time almost all users do this. However, some users are making changes then clicking a Link, thereby losing their changes.
I could always execute my save method in the backing bean when a link is clicked, but, most of the time this would be doing a lot of processing which usually would not be necessry.
Is their some way to check if any changes have been made and then doing the save only when necessary?
Regards,
Al Malin

Anybody?
What would be beneficial is something like this. If somehow it could be determined if any of the JSF fields on the page were modified. Then, in the backing bean method that handles the ActionEvents for the links, I would check if changes were made and, if so, call my save method.
In other words is it possible to determine, in the backing bean, whether or not JSF fields have changed?
Regards,
Al Malin

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