// #xxx and #xxxxxx
E.util.HEXCheck=function(s)
{
  return (s.match(/^#([a-f0-9]{3}|[a-f0-9]{6})$/i)) ? true : false
}

E.util.rgbCheck=function(s)
{
  return (s.match(/^rgb\((\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3})\)$/)) ? true : false
}

E.util.colorCheck=function(s)
{
  if (s.length<1)
    return true
  switch (s[0])
  {
    case '#':
      return E.util.HEXCheck(s)
    case 'R':
    case 'r':
      if (s[1]=="g" || s[1]=="G")
        return E.util.rgbCheck(s)
    default:
      var colors={
        aliceblue: 'f0f8ff',antiquewhite: 'faebd7',
        aqua: '00ffff',aquamarine: '7fffd4',
        azure: 'f0ffff',beige: 'f5f5dc',
        bisque: 'ffe4c4',black: '000000',
        blanchedalmond: 'ffebcd',blue: '0000ff',
        blueviolet: '8a2be2',brown: 'a52a2a',
        burlywood: 'deb887',cadetblue: '5f9ea0',
        chartreuse: '7fff00',chocolate: 'd2691e',
        coral: 'ff7f50',cornflowerblue: '6495ed',
        cornsilk: 'fff8dc',crimson: 'dc143c',
        cyan: '00ffff',darkblue: '00008b',
        darkcyan: '008b8b',darkgoldenrod: 'b8860b',
        darkgray: 'a9a9a9',darkgreen: '006400',
        darkkhaki: 'bdb76b',darkmagenta: '8b008b',
        darkolivegreen: '556b2f',darkorange: 'ff8c00',
        darkorchid: '9932cc',darkred: '8b0000',
        darksalmon: 'e9967a',darkseagreen: '8fbc8f',
        darkslateblue: '483d8b',darkslategray: '2f4f4f',
        darkturquoise: '00ced1',darkviolet: '9400d3',
        deeppink: 'ff1493',deepskyblue: '00bfff',
        dimgray: '696969',dodgerblue: '1e90ff',
        feldspar: 'd19275',firebrick: 'b22222',
        floralwhite: 'fffaf0',forestgreen: '228b22',
        fuchsia: 'ff00ff',gainsboro: 'dcdcdc',
        ghostwhite: 'f8f8ff',gold: 'ffd700',
        goldenrod: 'daa520',gray: '808080',
        green: '008000',greenyellow: 'adff2f',
        honeydew: 'f0fff0',hotpink: 'ff69b4',
        indianred : 'cd5c5c',indigo : '4b0082',
        ivory: 'fffff0',khaki: 'f0e68c',
        lavender: 'e6e6fa',lavenderblush: 'fff0f5',
        lawngreen: '7cfc00',lemonchiffon: 'fffacd',
        lightblue: 'add8e6',lightcoral: 'f08080',
        lightcyan: 'e0ffff',lightgoldenrodyellow: 'fafad2',
        lightgrey: 'd3d3d3',lightgreen: '90ee90',
        lightpink: 'ffb6c1',lightsalmon: 'ffa07a',
        lightseagreen: '20b2aa',lightskyblue: '87cefa',
        lightslateblue: '8470ff',lightslategray: '778899',
        lightsteelblue: 'b0c4de',lightyellow: 'ffffe0',
        lime: '00ff00',limegreen: '32cd32',
        linen: 'faf0e6',magenta: 'ff00ff',
        maroon: '800000',mediumaquamarine: '66cdaa',
        mediumblue: '0000cd',mediumorchid: 'ba55d3',
        mediumpurple: '9370d8',mediumseagreen: '3cb371',
        mediumslateblue: '7b68ee',mediumspringgreen: '00fa9a',
        mediumturquoise: '48d1cc',mediumvioletred: 'c71585',
        midnightblue: '191970',mintcream: 'f5fffa',
        mistyrose: 'ffe4e1',moccasin: 'ffe4b5',
        navajowhite: 'ffdead',navy: '000080',
        oldlace: 'fdf5e6',olive: '808000',
        olivedrab: '6b8e23',orange: 'ffa500',
        orangered: 'ff4500',orchid: 'da70d6',
        palegoldenrod: 'eee8aa',palegreen: '98fb98',
        paleturquoise: 'afeeee',palevioletred: 'd87093',
        papayawhip: 'ffefd5',peachpuff: 'ffdab9',
        peru: 'cd853f',pink: 'ffc0cb',
        plum: 'dda0dd',powderblue: 'b0e0e6',
        purple: '800080',red: 'ff0000',
        rosybrown: 'bc8f8f',royalblue: '4169e1',
        saddlebrown: '8b4513',salmon: 'fa8072',
        sandybrown: 'f4a460',seagreen: '2e8b57',
        seashell: 'fff5ee',sienna: 'a0522d',
        silver: 'c0c0c0',skyblue: '87ceeb',
        slateblue: '6a5acd',slategray: '708090',
        snow: 'fffafa',springgreen: '00ff7f',
        steelblue: '4682b4',tan: 'd2b48c',
        teal: '008080',thistle: 'd8bfd8',
        tomato: 'ff6347',turquoise: '40e0d0',
        violet: 'ee82ee',violetred: 'd02090',
        wheat: 'f5deb3',white: 'ffffff',
        whitesmoke: 'f5f5f5',yellow: 'ffff00',
        yellowgreen: '9acd32',
        inherit:true,transparent:true
      }
      if (colors[s])
        return true
  }
  return false
}