Is there a function available to do url encoding? I can't find any in the docs, and the ones I've found on the web aren't working in GD Gadget Designer.

For example this one:

function urlEncode(str){ str=escape(str); str=str.replace(new RegExp('\\+','g'),'%2B'); return str.replace(new RegExp('%20','g'),'+'); }

urlEncode("this has spaces and % signs and & signs")

returns

""this+has+spaces+and++signs+and++signs"

It converts the spaces correctly, but loses the % and & characters.