get guid(){
            return $uuid;
        }
getComputedStyle

Firefox 3.6:
 - Requires both elements to be present else an
   exception is thrown.
 - Returns a 'ComputedCSSStyleDeclaration' object.
   while a raw element.style returns a 'CSSStyleDeclaration' object.
 - Bogus input also throws exception

Safari 4:
 - Requires one argument (second can be MIA)
 - Returns a CSSStyleDeclaration object
 - if bad imput, returns null

getComputedStyle should really be an "add on" from the css
modules.  Unfortunately, 'window' comes way after the 'css'
so css can't add it.