Can anyone help me?
Because it looks like the site also uses PHP for the conversion. I downloaded the code, but it looks like PHP creates a different script for each recipe. As for the simple multiplication, I need to be able to convert recipe units as well (cups, tablespoons, etc) Do you know of a way to convert it?
If you use Firefox, Chrome or Safari, and opened the developer tools/firebug, and adjusted the servings you'd see that the site is using that to make an ajax request. Which then returns a full block of html that is replaced on the site.