Drag and Drop images in web application

Hi friends,

In my application i want to drag image present on same page.And place them at new location on same page.Using this drag and drop operation i want to create tree like structure.When user click on save button the tree structure should get save in image file.

I am not getting from where should i start.If any one have idea please help me.

It's very urgent.

Thanks in advance

[416 byte] By [AP_javaa] at [2007-11-27 5:42:05]