Find and make a backup copy of the Core.JS file(14templatelayoutsinc)
Edit the Core.JS file(14templatelayoutsinc)
Find the function called ErrorVisualization_ShowShortMessage
Add “return;” as the first command in the function.ErrorVisualization_ShowShortMessage(b,a,g){return;ULSrLq:;var h=g[2],d=””,e=null;if(!

 Reset IIS

 http://sharepointfeaturesandfailures.blogspot.com/2008/03/turn-off-hover-over-screen-tips-on.html