Hi there -- this is in response to jQuery Color Animations: Adding RGBA alpha channel�support - SharePoint Zen:

Maybe this could help you

jQuery.rgba = (function()
{
var
p = document.createElement('p'),
r = false ;
try { p.style.color = 'rgba(1,1,1,0.5)' ; r = /^rgba/.test(p.style.color); } catch(e) { };
p = null;
return r ;
})();

// OR this extended function

jQuery.color.support =
(function()
{
var
p = document.createElement('p'),
s = { rgb:false, rgba:false, hsl:false, hsla:false };
try { p.style.color = 'rgb(1,1,1)' ; s.rgb = /^rgb/.test(p.style.color); } catch(e) { };
try { p.style.color = 'rgba(1,1,1,0.5)' ; s.rgba = /^rgba/.test(p.style.color); } catch(e) { };
try { p.style.color = 'hsl(1,1,1)' ; s.hsl = /^hsl/.test(p.style.color); } catch(e) { };
try { p.style.color = 'hsla(1,1,1,0.5)' ; s.hsla = /^hsla/.test(p.style.color); } catch(e) { };
s.alpha = ( s.rgba || s.hsla ) ? true : false ;
p = null;
return s ;
})()