Sue, water tends to run downwards i.e. the water you see on the floor will very probably be coming from above (WC, bath or sink) rather than from pipework or drain underneath - you may indeed need to take up the floor or make some kind of repair or not have to bother at all with the floor - whatever you decide to do it will not stop the water from above.
Look to the source of the water first and fix it. It is not unusual for instance for a WC pan to leak from the joint with the close coupled cistern (an easy fix) - just a small amount every time the loo is flushed - a small puddle forms.
When you've found the source of the water and solved the problem give the floor a chance to dry out and then attend to it.
Bathrooms are often relatively small - a completely new set of laminate boards will not cost a fortune and what fun you can have laying them.
Good luck...
Peccavi
October 2009