passing values with a drop down menu

how can i pass values with a drop down drop down contains a list of manufacturer names.i want to display a value of a variable each time a manufacturer is selected from the drop down.the value of this variable depends on the manufacturer so i need to pass the manufacturer id with the drop can i do this.please help..
There are different ways for this.
You can keep your drop down list inside a form which can be submitted to same page or a different page by clicking a button or by using onselection event of drop down button. To work on drop down list box you can read this

Another way is to use Ajax with PHP ( if you can manage this is better way )
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