Problem in firefox and IE9 with gks_tooltip_stock display none

Dear Gavick,

i have a small problem with the css of gk_stock. I set in config show chart off. When i load home page the page gets stretch by gk_stock. The css file says:

.gks_tooltip_data {
display: none;}

when i mouse over one of the stock items the page gets back to normal length.

Hope you can help me solve this item.

See attach. for difference in length.

or live: http://www.onzefinancien.nl/