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Demo:
* Cách làm :

•Chèn đoạn sau vào CSS ( vào Display>colors> CSS style)

Code:

.colorpicker {
  width: 356px;
  height: 176px;
  overflow: hidden;
  position: absolute;
  background: url(http://www.c3z.co.cc/users/2611/10/63/87/album/bg10.png);
  font-family: Arial, Helvetica, sans-serif;
  display: none;
}
.colorpicker_color {
  width: 150px;
  height: 150px;
  left: 14px;
  top: 13px;
  position: absolute;
  background: #fff;
  overflow: hidden;
  cursor: crosshair;
}
.colorpicker_color div {
  position: absolute;
  top: 0;
  left: 0;
  width: 150px;
  height: 150px;
  background: url(http://www.c3z.co.cc/users/2611/10/63/87/album/ovl10.png);
}
.colorpicker_color div div {
  position: absolute;
  top: 0;
  left: 0;
  width: 11px;
  height: 11px;
  overflow: hidden;
  background: url(http://www.c3z.co.cc/users/2611/10/63/87/album/select10.gif);
  margin: -5px 0 0 -5px;
}
.colorpicker_hue {
  position: absolute;
  top: 13px;
  left: 171px;
  width: 35px;
  height: 150px;
  cursor: n-resize;
}
.colorpicker_hue div {
  position: absolute;
  width: 35px;
  height: 9px;
  overflow: hidden;
  background: url(http://www.c3z.co.cc/users/2611/10/63/87/album/indic10.gif) left top;
  margin: -4px 0 0 0;
  left: 0px;
}
.colorpicker_new_color {
  position: absolute;
  width: 60px;
  height: 30px;
  left: 213px;
  top: 13px;
  background: #fff;
}
.colorpicker_current_color {
  position: absolute;
  width: 60px;
  height: 30px;
  left: 283px;
  top: 13px;
  background: #fff;
}
.colorpicker input {
  background-color: transparent;
  border: 1px solid transparent;
  position: absolute;
  font-size: 10px;
  font-family: Arial, Helvetica, sans-serif;
  color: #898989;
  top: 4px;
  right: 11px;
  text-align: right;
  margin: 0;
  padding: 0;
  height: 11px;
}
.colorpicker_hex {
  position: absolute;
  width: 72px;
  height: 22px;
  background: url(http://www.c3z.co.cc/users/2611/10/63/87/album/hex10.png) top;
  left: 212px;
  top: 142px;
}
.colorpicker_hex input {
  right: 6px;
}
.colorpicker_field {
  height: 22px;
  width: 62px;
  background-position: top;
  position: absolute;
}
.colorpicker_field span {
  position: absolute;
  width: 12px;
  height: 22px;
  overflow: hidden;
  top: 0;
  right: 0;
  cursor: n-resize;
}
.colorpicker_rgb_r, .colorpicker_rgb_g, .colorpicker_rgb_b {
  background-image: url(http://www.c3z.co.cc/users/2611/10/63/87/album/rgb_r10.png);
}
.colorpicker_rgb_r {
  top: 52px;
  left: 212px;
}
.colorpicker_rgb_g {
  top: 82px;
  left: 212px;
}
.colorpicker_rgb_b {
  top: 112px;
  left: 212px;
}
.colorpicker_hsb_h, .colorpicker_hsb_s, .colorpicker_hsb_b {
  background-image: url(http://www.c3z.co.cc/users/2611/10/63/87/album/h10.png);
}
.colorpicker_hsb_h {
  top: 52px;
  left: 282px;
}
.colorpicker_hsb_s {
  top: 82px;
  left: 282px;
}
.colorpicker_hsb_b {
  top: 112px;
  left: 282px;
}
.colorpicker_submit {
  position: absolute;
  width: 22px;
  height: 22px;
  background: url(http://www.c3z.co.cc/users/2611/10/63/87/album/submit10.png) top;
  left: 322px;
  top: 142px;
  overflow: hidden;
}
.colorpicker_focus {
  background-position: center;
}
.colorpicker_hex.colorpicker_focus, .colorpicker_submit.colorpicker_focus, .colorpicker_slider{
  background-position: bottom;
}

•Chèn vào widget đoạn script sau (đối với tất cả phiên bản) . Với phpbb2 hoặc punbb có thể chèn vào overall_header, overall_footer, hoặc chèn viewtopic_body và posting_body.

Code:

<script src="http://scriptfm.googlecode.com/files/colpicker.js"></script>