I use this one:
But i don't know:
*in wich directory i should but my "supersleight.js"
the theme directory?
*and where and in wich file i should put:
the theme "header.php" ?
the theme "index.php" ?
the wordpress index.php? (seems very unlikely)
Maybe i just need another script, but i've treid so many so far so i just guess i've been doing things wrong. Most page explain that you should put the code in your index, but where should i put it if i use wordpress?