Try hiding all the dropdowns whenever onmouseover event occurs on the menu item. Similarly, unhide the dropdowns whenever onmouseout event occurs.
code would be something like below -
function toggleDropdown(action) {
var dropdowns = document.getElementsByTagName('select');
var cssText = action ? 'none' : '';
for(i = 0; i < dropdowns.length; i++) {
dropdowns[i].style.display = cssText;
}
Hope this may help you out...
Regards,
Niral Soni