Menu - change time needed

Hello
On s558382872.online.de i use top menu with "Foto-Archiv". Mouse over and the sub-menu open. mouse over on , for example, "Events" makes open the next level. That´s okay, but: If i try to click on Foto-Archiv / Events / Lifeball the submenu went of because of the time ?
Is there a way to change the speed of the nav-childs ?
Thx

Open template_css.css

replace:

#nav li ul ul {
left: 145px;
margin: 0;
}

with:

#nav li ul ul {
left: 135px;
margin: 0;
}