Allow the user to add a function in the options which is called when a node
is dragged and dropped over an other one. The function would receive two
parameters and return true/false. The first parameter would be the destination node
and the second the dragged node.
An example:
tree = $('.simpleTree').simpleTree({
autoclose: false,
afterDnD: function(dest, droped) {
return conditionHolds;
},
..........
});
If afterDnD returns false, the dragged node should not change it's parent