Actually using var makes the function more reusable. For one, having the reference allows you to pass it along to other functions. Further, declaring a function without var is not the same as throwing it into global scope, it can still only be accessed by the local scope *unless you assign it to a global variable of course :)
You can pass any function as an object everywhere you want, i.e. function someName(){} still maps to the identifier someName that is scoped where it was declared and can be passed around to other objects and functions. No need to "var someName = function someName..." to do so.
