[development] Hierarchical select breaks custom js

I am building case-tracker on top of Open Atrium. My case node has some custom fields. Case category is hierarchical select taxonomy field. I have another field called level which is dynamic and expected to changed as an when the value of hierarchical select field input changes with a custom js script. it works fine however when hierarchical select makes an ajax update of node form my custom js stops working. I checked firefox JS error console and drupal recent log could not find any errors. For some reason hierarchical select suppressing my custom js script. If you know suggestion, please let me know. Thanks in advance. With regards Vishnuvarthan Perumal SG E-ndicus Info Tech Pvt Ltd +91 44 65153168