Please include the name-to-hex color conversion in the native library:

// Here is the solution tied together as a native String native extension using

// MooTools, though you can implement the same thing in whatever framework you prefer:

(function(String){

var valueMatch = {
'rgb(0,0,0)': { 'black': ' ', 'rgb(0,0,0)': ' ' },
'rgba(0,0,0,0)': { 'transparent': ' ', 'rgba(0,0,0,0)': ' ' },
'#ffffff': { 'transparent': ' ' },
'transparent': { 'transparent': ' ' }
},
colorFromProbe = function(color){
color = color.toString();
if(!color.match(/^#.+$|^[^0-9]+$/)) return color;
var probe = ($('moocolorprobe') || new Element('textarea', {
'id': 'moocolorprobe',
'styles': {
'display': 'none',
'color': 'transparent'
}
}).inject(document.body, 'after'));
try{ probe.setStyle('color', color) } catch(e){ return color } //IE throws an error instead of defaulting the style to some color or transparent when the value is unrecognized
var computed = (Browser.ie) ? ieColorToHex(probe) : (Browser.opera) ? probe.style.color : probe.getComputedStyle('color'),
match = valueMatch[computed.replace(/ /g, '')];
probe.setStyle('color', 'transparent');
if((!Browser.ie || Browser.ie9) && color == 'transparent' && (match && match['transparent'])) return 'rgba(0, 0, 0, 0)';
return (computed == 'transparent' || match && !match[color.replace(/ /g, '')]) ? color : computed;
},
ieColorToHex = function(probe){ // Special IE mojo, thanks to Dean Edwards for the inspiration, his code used a pop-up window to test the color, I found you can simply use a textarea instead ;)
var value = probe.set('value', '').createTextRange().queryCommandValue("ForeColor");
value = (((value & 0x0000ff) << 16) | (value & 0x00ff00) | ((value & 0xff0000) >>> 16)).toString(16);
return "#000000".slice(0, 7 - value.length) + value;
};

String.implement({ 
    colorToRgb: function(){ 
        var color = colorFromProbe(this); 
        return (color.charAt(0) == '#') ? color.hexToRgb() : color; 
    }, 
    colorToHex: function(){ 
        var color = colorFromProbe(this); 
        return (color.test('rgb')) ? color.rgbToHex() : color; 
    } 
}); 

})(String);

Taken from: http://stackoverflow.com/a/3892864/863980
More read: http://www.backalleycoder.com/2010/10/05/converting-css-named-colors-to-rgb-and-hex/