php

i had two table in database category and subcategory ,i want to display those data in this way on web page....i have two select field category and sub category ...if we select something in category the sub-category related to that should display in sub-category select option.for example we had two category moblile,dvdplayer...sub-category related to mobile are nokia,samsung........and sud category related to dvdplayer are akash,tcl.......if we select option mobile in category selec option then in sub-category select option we should only have nokia and samsung....and when we select dvdplayer in category option we should have only akash and tcl in sub-category option using only html php javascript .......all data should come from database

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