How keep high resolution in enlarged image?

Hi!
When I insert my logo in Dreamweaver, I first need to give it a certain size in Photoshop (if I fix the size in dreamweaver, the logo doesn't get sharp). But I would like logo to have a better resolution when my webpage gets enlarged (for example when reading it in mobiles). I've seen some pictures on webpages that keep their resolution even when you enlarge the webpage. How can you do that?
Greatful for help!
Milda
Message was edited by: mildar
PS. Does it help if I make the logo in Illustrator instead?
Message was edited by: mildar

Hi
Adninjastrator wrote -
it might be worth noting that mobile device resolution is much greater
than 72 or 96 px/in. The iPhone 4 for example has 326px/in.
Murray is correct with his 72ppi, (this is for Macs) and 96 ppi, (this is for windows).
New Apples iDevices do have a screen resolution of 326ppi but not the safari browser for iOS, which still conforms to the macs ppi, (72). It' a similar situation to comparing your system/monitor screen resolution with your browsers screen resolution, you may have a HD screen but the browser still uses the browsers ppi for your system.
PZ

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joeyMPI
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DSLR
1080p
DSLR [email protected]
Close out of there.
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ATR

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