Form Navigation via Dynamic Colour Changes to Dropdown Text

Form Navigation via Dynamic Colour Changes to Dropdown Text

Can anyone assist ?
I have a multistep form comprising various dynamic DD selects that a user is guided thru using purple buttons that light up to prompt user navigation & selections in the correct order. Step1 snippet of the overall form is shown here:
[URL="http://www.jcsweb.biz/mef/client/wd_scen_lev/Step1_01j.php"]http://www.jcsweb.biz/mef/client/wd_scen_lev/Step1_01j.php[/URL]

To optimise the layout, I wish to remove the buttons that light up but maintain the
colour-guided navigation using dropdown text that turns Purple to prompt user selection then turns back to black once selection made. The order of the DD selections is evident  form the form layout, namely:  Region:, Item:, Size:, Start:, End:

Any smart jquery UI method that I can use to replace my existing buttons in order to guide the user thru the form via dynamic Text colour changes of the DD content text ? Unfortunately, my search of the forum didn't reveal anything which achieves this already.