problem with mouseover on a table cell

[kunle Adeyinka]

Hi there I have a problem.
I have a table with a table head and body.
In the table header I have 9 columns and each header column has a table nested in it.Each nested table has three columns.
I am trying to get a mouseover event on the header column or cell but it is only working on the edges of the cell and not in the cell itself.Does anyone know what my problem is.