I've created a contact page using a BizForms web part (which in turn uses a form with a custom layout).

The form has a drop down called "Contact Reason" and I need the form to dynamically show an extra input field if a particular reason is selected.

e.g. If reason selected is "Existing Customer" then an input box which prompts for a loan number should show.

So I need an "id" for my jquery code to detect.

So far, all I've been able to do is put the following between table cell tags

$$label:ContactReason$$ $$input:ContactReason$$

How would I add a meaningful "id" that I could use instead of the "id" generated by KencitoCMS e.g. id="plc_lt_pageContent_pageplaceholder_pageplaceholder_lt_middleColumn_BizForm_viewBiz_ctl00_ContactReason"

I'm very new with KenticoCMS so I'm sorry if this has been answered elsewhere.