drop down list wise xml all attribute value

[danger11]

i have one xml file:-\[code\]<child_4 entity_id="4" value="http://stackoverflow.com/questions/15716843/Activities" parent_id="2"> <child_10066 entity_id="10066" value="http://stackoverflow.com/questions/15716843/Physical1" parent_id="4"> <child_10067 entity_id="10067" value="http://stackoverflow.com/questions/15716843/Cricket" parent_id="10066"> <child_10068 entity_id="10068" value="http://stackoverflow.com/questions/15716843/One Day" parent_id="10067"/> </child_10067> </child_10066> <child_10069 entity_id="10069" value="http://stackoverflow.com/questions/15716843/Test2" parent_id="4"/> <child_10070 entity_id="10070" value="http://stackoverflow.com/questions/15716843/Test3" parent_id="4"/> <child_10071 entity_id="10071" value="http://stackoverflow.com/questions/15716843/Test4" parent_id="4"/> <child_10072 entity_id="10072" value="http://stackoverflow.com/questions/15716843/Test5" parent_id="4"/> <child_5 entity_id="5" value="http://stackoverflow.com/questions/15716843/Physical" parent_id="4"/></child_4>\[/code\]i want to result some thing like this:-Firlst Look:-\[code\]ActivitiesTest2Test3Test4Test5Physical\[/code\]after click on \[code\]Activities\[/code\] drop down there child list:-\[code\]Activities PhysicallTest2Test3Test4Test5Physical\[/code\]if click on \[code\]Physicall\[/code\] \[code\]Activities Physicall CricketTest2Test3Test4Test5Physical\[/code\]something like tree type
look like drop down menu...
thanks...