path of image file in css

Hi,

What is the difference between using /, ../ and ./?
I have a folder structure
project
     src
     webapp
             js
               css1
                        images3
           css2
            images1
            style1    
                    css1
                          a1.css

what is the best way to refer images in images1 folder from a1.css ?
RockingAsked:
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Dave BaldwinFixer of ProblemsCommented:
Here http://en.wikipedia.org/wiki/Path_%28computing%29 is probably more than you wanted to know.  '/' is your home directory.  In a web site this can mean your web site home directory and not your user home directory.  './' is the current directory and '../' is the next higher directory in the current path.
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Dave BaldwinFixer of ProblemsCommented:
The most reliable way to refer to the images1 directory is "/project/ webapp/images1/img.jpg" because that path starts at the root of your directories and will always work from anyplace in your paths and directories above.
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RockingAuthor Commented:
What is the difference between using /, ../ and ./?

can i make ""/project/" as dynamic?
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Dave BaldwinFixer of ProblemsCommented:
can i make "/project/" as dynamic?
What does that mean?  Whatever you use for a 'path' to a file has to match what is actually on the server.
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RockingAuthor Commented:
suppose the name of the project changes then if i have hardcoded the project name,then it needs to be changed manually.
like in jsp we get teh context path same way can we get in css also? If yes then how?

If we can't get the context name in css file then the approach ../ would be much better as the project name changes we don't need to modify the project name in css file.
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Dave BaldwinFixer of ProblemsCommented:
CSS is entirely passive, it is a description language but not a programming language.  Some other language would have to change the 'project' name because there is nothing in CSS that can do that.
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RockingAuthor Commented:
ok it means that there are no ways in which we can pass the project name in the css file.

It means that the approach ./ will be the best if we need dynamic folders.

Can u please let me the know the difference between "using /, ../ and ./?"

Out of the tree which one is better ot use
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Dave BaldwinFixer of ProblemsCommented:
The three methods, " /, ../ and ./", are not interchangeable, they are used for different things.  Usage depends on the need and where the file is in the path structure.  See my first comment for details.
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