1. the fast way
... use a Social Bookmark Script - Generator to generate a script to your needs ...
... and add the java script in your template ...
... that's all ... a very fast and comfortable solution ...
2. the long way
... with more effort you can edit a php-file with e.g. a table and all bookmark links you want to show ...
... this file you can include in the main php-files or functions.php and register it there as e.g. "social_bookmark" ...
... so you can show with the tag {social_bookmark} the bookmark table in all templates ...
... that's all ... but I think it is a solution where PHP skills needed ...