Adding the default style in a seperate directory in preperation for new features.

styles/default/colorbox_default_style.css

+/* $Id$  */
+
+/*
+    ColorBox Core Style
+    The following rules are the styles that are consistant between themes.
+    Avoid changing this area to maintain compatability with future versions of ColorBox.
+*/
+#colorbox, #cboxOverlay, #cboxWrapper {
+  position: absolute;
+  top: 0;
+  left: 0;
+  z-index: 9999;
+  overflow: hidden;
+}
+#cboxOverlay {
+  position: fixed;
+  width: 100%;
+  height: 100%;
+}
+#cboxMiddleLeft, #cboxBottomLeft {
+  clear: left;
+}
+#cboxContent {
+  position: relative;
+  overflow: hidden;
+}
+#cboxLoadedContent {
+  overflow: auto;
+}
+#cboxLoadedContent iframe {
+  display: block;
+  width: 100%;
+  height: 100%;
+  border: 0;
+}
+#cboxTitle {
+  margin: 0;
+}
+#cboxLoadingOverlay, #cboxLoadingGraphic {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+}
+#cboxPrevious, #cboxNext, #cboxClose, #cboxSlideshow {
+  cursor: pointer;
+}
+
+/*
+    ColorBox example user style
+    The following rules are ordered and tabbed in a way that represents the
+    order/nesting of the generated HTML, so that the structure easier to understand.
+*/
+#cboxOverlay {
+  background: #000;
+}
+
+#colorBox {}
+  #cboxWrapper {
+    background: #fff;
+    border-radius: 5px;
+    -moz-border-radius: 5px;
+    -webkit-border-radius: 5px;
+  }
+    #cboxTopLeft {
+      width: 15px;
+      height: 15px;
+    }
+    #cboxTopCenter {
+      height: 15px;
+    }
+    #cboxTopRight {
+      width: 15px;
+      height: 15px;
+    }
+    #cboxBottomLeft {
+      width: 15px;
+      height: 10px;
+    }
+    #cboxBottomCenter {
+      height: 10px;
+    }
+    #cboxBottomRight {
+      width: 15px;
+      height: 10px;
+    }
+    #cboxMiddleLeft {
+      width: 15px;
+    }
+    #cboxMiddleRight {
+      width: 15px;
+    }
+    #cboxContent {
+      background: #fff;
+      font: 12px "Lucida Grande", Verdana, Arial, sans-serif;
+    }
+      #cboxLoadedContent {
+        margin-bottom: 28px;
+      }
+      #cboxTitle {
+        position: absolute;
+        background: rgba(255, 255, 255, 0.7);
+        bottom: 28px;
+        left: 0;
+        color: #535353;
+        width: 100%;
+        padding: 4px;
+      }
+      #cboxCurrent {
+        position: absolute;
+        bottom: 4px;
+        left: 60px;
+        color: #949494;
+      }
+      .cboxSlideshow_on #cboxSlideshow {
+        position: absolute;
+        bottom: 0px;
+        right: 30px;
+        background: url(images/controls.png) -75px -50px no-repeat;
+        width: 25px;
+        height: 25px;
+        text-indent: -9999px;
+      }
+      .cboxSlideshow_on #cboxSlideshow.hover {
+        background-position: -101px -50px;
+      }
+      .cboxSlideshow_off #cboxSlideshow {
+        position: absolute;
+        bottom: 0px;
+        right: 30px;
+        background: url(images/controls.png) -49px -50px no-repeat;
+        width: 25px;
+        height: 25px;
+        text-indent: -9999px;
+      }
+      .cboxSlideshow_off #cboxSlideshow.hover {
+        background-position: -25px -50px;
+      }
+      #cboxPrevious {
+        position: absolute;
+        bottom: 0;
+        left: 0;
+        background: url(images/controls.png) -75px 0px no-repeat;
+        width: 25px;
+        height: 25px;
+        text-indent: -9999px;
+      }
+      #cboxPrevious.hover {
+        background-position: -75px -25px;
+      }
+      #cboxNext {
+        position: absolute;
+        bottom: 0;
+        left: 27px;
+        background: url(images/controls.png) -50px 0px no-repeat;
+        width: 25px;
+        height: 25px;
+        text-indent: -9999px;
+      }
+      #cboxNext.hover {
+        background-position: -50px -25px;
+      }
+      #cboxLoadingOverlay {
+        background: #fff;
+      }
+      #cboxLoadingGraphic {
+        background: url(images/loading_animation.gif) center center no-repeat;
+      }
+      #cboxClose {
+        position: absolute;
+        bottom: 0;
+        right: 0;
+        background: url(images/controls.png) -25px 0px no-repeat;
+        width: 25px;
+        height: 25px;
+        text-indent: -9999px;
+      }
+      #cboxClose.hover {
+        background-position: -25px -25px;
+      }
+
+/* The following are fixes for IE. */
+.cboxIE #cboxTitle {
+  background: #fff;
+}

styles/default/colorbox_default_style.js

+// $Id$
+(function ($) {
+
+Drupal.behaviors.initColorboxDefaultStyle = function (context) {
+  $(document).bind('cbox_complete', function(){
+    // Only run if there is a title.
+    if ($('#cboxTitle:empty').length == false) {
+      setTimeout(function(){ $('#cboxTitle').slideUp() }, 1500);
+      $('#cboxLoadedContent').bind('mouseover', function(){
+        $('#cboxTitle').slideDown();
+      });
+      $('#cboxOverlay').bind('mouseover', function(){
+        $('#cboxTitle').slideUp();
+      });
+    }
+    else {
+      $('#cboxTitle').hide();
+    }
+  });
+};
+
+})(jQuery);
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