dynamic dropdown menu - brand new to this

hi im interested to learn how website such as www.autotrader.co.uk have that drop down menu

when when you change make, it gives you a different list in model.

i have no experence with javascript or ajax and would love it if you could explain it to me, or direct me to a tutorial.

what i want to do is create a database with different car makes, model, varient and year and somehow this to dynamically appear in the dropdown boxs.

e.g.
in a table if i have inputed the data make - ford model - mondeo varient - 1.6 year -2005
then dynamically an option for ford appears in the makes drop down, when thats clicked dynamically the option mondeo appears in the model drop down etc.

isit possible?

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