firefox 3.5 problem with graph zoom display - ymon 4.2.2-RC1-2008.12.01

Hi

I am running Xymon 4.2.2-RC1-2008.12.01 and have a problem with some, but not all browsers.

The problem occurs, then I go to Trends and selects the magnifying glass ican. The graph displayed for zooming is displayed and immediately coveret with a blue square.

This occurs in: firefox 3.5 and Opera 9.64

This does not occur in: firefox 3.0, Crome 2.0.172.37 and IE 8.0.6001

All hints are appreciated.

Best regards

Harald Villemoes