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removing items from drop down in Javascript

lavi mendonca
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i have 2 dropdown/ list parent and child. If one of the options in the parent list is selected, then in the child listbox, i only want to display some of the options and not all the values previously displayed. If i choose some other option in the parent dropdown, then some other values should be displayed in the child drop down. But no empty row should be displayed..Could someone help out..
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