Dialog demo: Use the ui-state-highlight class instead of a hard-coded color.  Fixes #4808 - Modal dialog form validation demo - error message uses hard-coded color.
Dialog demo: Use the ui-state-highlight class instead of a hard-coded color.  Fixes #4808 - Modal dialog form validation demo - error message uses hard-coded color.

GrayYoung/jQuery.UI.Extension,GrayYoung/jQuery.UI.Extension