feed it a hex code and it returns the inverse

get inverse hex

function invert_color(color) {
	color = color.replace('#', '');

	r = color.substr(0,2);
	g = color.substr(2,2);
	b = color.substr(4,2);

	inverted_r = 255 - parseInt(r,16);
	inverted_g = 255 - parseInt(g,16);
	inverted_b = 255 - parseInt(b,16);

	var hexbase = "0123456789ABCDEFabcdef";
	inverted_r_hex = hexbase.charAt((inverted_r>> 4)& 0xf)+ hexbase.charAt(inverted_r& 0xf);
	inverted_g_hex = hexbase.charAt((inverted_g>> 4)& 0xf)+ hexbase.charAt(inverted_g& 0xf);
	inverted_b_hex = hexbase.charAt((inverted_b>> 4)& 0xf)+ hexbase.charAt(inverted_b& 0xf);

	return '#' + inverted_r_hex + inverted_g_hex + inverted_b_hex;
}