Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 7175)
+++ /CKEditor/trunk/CHANGES.html	(revision 7176)
@@ -49,4 +49,5 @@
 		<li><a href="http://dev.ckeditor.com/ticket/8155">#8155</a> : Tooltips in the Special Character dialog window corrected.</li>
 		<li><a href="http://dev.ckeditor.com/ticket/8163">#8163</a> : The name of the <code><a href="http://docs.cksource.com/ckeditor_api/symbols/CKEDITOR.config.html#.filebrowserWindowFeatures">filebrowserWindowFeatures</a></code> configuration setting corrected to match the documented name.</li>
+		<li><a href="http://dev.ckeditor.com/ticket/8124">#8124</a> : The "style" field in advanced dialog tab are now validated according to CSS style attribute syntax.</li>
 		<li>Updated the following language files:<ul>
 			<li><a href="http://dev.ckeditor.com/ticket/8128">#8128</a> : Italian;</li>
Index: /CKEditor/trunk/_source/lang/en.js
===================================================================
--- /CKEditor/trunk/_source/lang/en.js	(revision 7175)
+++ /CKEditor/trunk/_source/lang/en.js	(revision 7176)
@@ -124,4 +124,5 @@
 		invalidCssLength	: 'Value specified for the "%1" field must be a positive number with or without a valid CSS measurement unit (px, %, in, cm, mm, em, ex, pt, or pc).',
 		invalidHtmlLength	: 'Value specified for the "%1" field must be a positive number with or without a valid HTML measurement unit (px or %).',
+		invalidInlineStyle	: 'Value specified for the inline style must be one or multiple tuples with the form "name : value" which are separated by semi-colon.',
 
 		// Put the voice-only part of the label in the span.
Index: /CKEditor/trunk/_source/plugins/dialog/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/dialog/plugin.js	(revision 7175)
+++ /CKEditor/trunk/_source/plugins/dialog/plugin.js	(revision 7176)
@@ -2940,5 +2940,6 @@
 			numberRegex = /^\d*(?:\.\d+)?$/,
 			htmlLengthRegex = /^(((\d*(\.\d+))|(\d*))(px|\%)?)?$/,
-			cssLengthRegex = /^(((\d*(\.\d+))|(\d*))(px|em|ex|in|cm|mm|pt|pc|\%)?)?$/i;
+			cssLengthRegex = /^(((\d*(\.\d+))|(\d*))(px|em|ex|in|cm|mm|pt|pc|\%)?)?$/i,
+			inlineStyleRegex = /^(\s*[\w-]+\s*:\s*[^:;]+(?:;|$))*$/;
 
 		CKEDITOR.VALIDATE_OR = 1;
@@ -3030,4 +3031,9 @@
 			{
 				return this.functions( function( val ){ return htmlLengthRegex.test( CKEDITOR.tools.trim( val ) ); }, msg );
+			},
+
+			'inlineStyle' : function( msg )
+			{
+				return this.functions( function( val ){ return inlineStyleRegex.test( CKEDITOR.tools.trim( val ) ); }, msg );
 			},
 
Index: /CKEditor/trunk/_source/plugins/dialogadvtab/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/dialogadvtab/plugin.js	(revision 7175)
+++ /CKEditor/trunk/_source/plugins/dialogadvtab/plugin.js	(revision 7176)
@@ -133,4 +133,5 @@
 						'default' : '',
 
+						validate : CKEDITOR.dialog.validate.inlineStyle( lang.invalidInlineStyle ),
 						onChange : function(){},
 
Index: /CKEditor/trunk/_source/plugins/flash/dialogs/flash.js
===================================================================
--- /CKEditor/trunk/_source/plugins/flash/dialogs/flash.js	(revision 7175)
+++ /CKEditor/trunk/_source/plugins/flash/dialogs/flash.js	(revision 7176)
@@ -662,4 +662,5 @@
 							type : 'text',
 							id : 'style',
+							validate : CKEDITOR.dialog.validate.inlineStyle( editor.lang.common.invalidInlineStyle ),
 							label : editor.lang.common.cssStyle,
 							setup : loadValue,
Index: /CKEditor/trunk/_source/plugins/image/dialogs/image.js
===================================================================
--- /CKEditor/trunk/_source/plugins/image/dialogs/image.js	(revision 7175)
+++ /CKEditor/trunk/_source/plugins/image/dialogs/image.js	(revision 7176)
@@ -1350,4 +1350,5 @@
 							id : 'txtdlgGenStyle',
 							label : editor.lang.common.cssStyle,
+							validate : CKEDITOR.dialog.validate.inlineStyle( editor.lang.common.invalidInlineStyle ),
 							'default' : '',
 							setup : function( type, element )
Index: /CKEditor/trunk/_source/plugins/link/dialogs/link.js
===================================================================
--- /CKEditor/trunk/_source/plugins/link/dialogs/link.js	(revision 7175)
+++ /CKEditor/trunk/_source/plugins/link/dialogs/link.js	(revision 7176)
@@ -1160,4 +1160,5 @@
 										'default' : '',
 										id : 'advStyles',
+										validate : CKEDITOR.dialog.validate.inlineStyle( editor.lang.common.invalidInlineStyle ),
 										setup : setupAdvParams,
 										commit : commitAdvParams