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then have a user id linked to a style
thne basicaly when the page loads it will run a query and use the css sheet that matches the user
is there a way of having a difrent css loaded into a page ?
This is possible, just reference a php script to output your css instead of writing a .css file to the system.
<link rel="stylesheet" href="/pathtomyscript.php?css=1" />
//output of script...
//output the css