Don't know how to explain, but using the form on this page: http://www.completeradiators.com/shop/search.asp selecting the product the form will jump to the make form and then to the OEM #. How do you create a form that does this?
I looks like it's using the Ajax Technology or something similar to it Search the web for Ajax tutorials but if you're already familiar to it then all you need are callback functions ( javascript ) that will display the next object for you and hide the previous one.
AJAX is not being used on this page. All that is happening is that an event is being fired (onChange) when you make a selection from the combo box. Here is the code that they are using: onChange="getResults(this.value,'results.asp','')" This calls the function getResults, passing in the value that you have just chosen, as well as a url. This is the code they are using for getResults: function getResults(o, p, e){ if (o != ""){ eval(e); document.f1.action = p; document.f1.submit(); } else window.alert("Please make another selection"); } All this function does is checks to see that you have chosen something in the combo, and then submits the form to the specified url. On the SERVER-SIDE there will be processing that evaluates what you chose in the combo box, rebuilds the page, and then posts it back to you. It sounds like you want a 2 level javascript combo script. If that is the case, check this out: http://www.javascriptkit.com/script/script2/2levelcombo.shtml Cheers.