link rel

Why does WP use:
style
@import url(urlhere)
/style
Instead of
link rel=”stylesheet” type=”text/css” media=”screen” href=”urlhere”
I ask because i read an article in ALA about changing stylesheets with javascript, and i would like to try that, but i am not sure if i will break something in WP if i change the way it links (or imports) the stylesheet…
Thanks,
Eduardo