Return Hex color from RGB format

gistfile1.js

/* Javascript function to convert rgb format to a hex color
 *  call   : rgb2hex( "rgb(0, 70, 255)" );
 *  returns: #0046ff
 */
function rgb2hex(rgb){
 rgb = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
 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);
}

Removed internal function & its calls.