rgb/a color to hex color

rgba2hex.js

// Partial credit for this goes to the broken script I found at http://www.sitepoint.com/jquery-convert-rgb-hex-color/
function rgb2hex(rgb){
	rgb = rgb.match(/^rgba?\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*(,\s*(\d*)\.?(\d*)\s*)?\)$/);
	return "#" +
	("0" + parseInt(rgb[1],10).toString(16)).slice(-2) +
	("0" + parseInt(rgb[2],10).toString(16)).slice(-2) +
	("0" + parseInt(rgb[3],10).toString(16)).slice(-2);
}