I'm trying to implement jQuery a font-resize script

got from here,

my implementation is not working, and I'm trying to figure out what the 2nd argument in his parseFloat fn is

 var finalNum = parseFloat(currFontSize, 10);
(is it maybe the default font-size in my 'body' tag?)

I searched for javascript parseFloat() fn, but have not found any examples of this fn with two arguments..

thank you..