Zindex - how to increase it?

Hi
This is a great plug in.
I have it working on joomla 3, but the zindex of the tooltips seems to be lower than the content in the right colum and is coming in behind it. I changed the zindex in the css of the plugin to 100000 but it made no difference.
Here is a link to the temp url:

d1077329.alias98.aura05.cust.servers.ie/index.php/ce-marking

thanks,
Breda

Hi
try to add a position:relative and z-index:999999 to #mainContent
CEd