Dynamically expanding the child node

[k.sri]

1) Script Title: Simple tree menu

2) Script URL (on DD): http://www.dynamicdrive.com/dynamicindex1/navigate1.htm

3) Describe problem: Hello,
Can anybody tell me how i can load the children on the click event of the tree menu? I mean i wud like to load only the parent node initially and then as i click on the parent the child shud be loaded. I have liek around 10,000 nodes and it takes a lot of time to load in IE 6.0 and i want to cut down the time.. I am using dynamic drive tree menu

Please help

Thanks