need help with z-index property [closed]

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I have a sprite image that is the background of a div and the div contains "li" elements with anchor links in them..I want that when user hovers over links ..diff parts of sprites' image are displayed in div's background..

now sprite was working great until I added a master page to my aspx page..the image hid behind the "Links"..but when I removed the Z-Index property in my css..the image appeare开发者_运维知识库d but the links got behind the image :/ so cant hover over links and test if the sprite is working or not..

now how do I set this z-index property so it works fine? new to all this so need help..thnx

Please find my code here

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For z-index to work, the element must have

position:relative;

,

position:absolute;

or

position:fixed;

position:relative; is probably what you will need in this case