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Go to JooCart or jCart admin panel,Find a button named "Parameters"(in Joomla 1.5.x) or "Options"(in Joomla 1.6.x-3.x) at the top-right or top-left corner.Click on it(in Joomla >=1.6.x See in Preferences Tab).
Set "Use Joomla buttons for JooCart or jCart" to Yes.
Done.Now you may see your button's color is changed according to Joomla css.
Please wait... it will take a second!