If <option>Engine</option> show <select name="liters"><option>4.0</opti</select>

[reconDev]

OK , I've made a form but I need a php script that will show the <select name="liters"> </select> field if  the user selects a "ENGINE" in the form.

[.josh]

php is a server side language. It is parsed and the results are then sent to the client (your browser).  It does not do "realtime" stuff like that.  Look into javascript.