Index: webapp/cms/plugins/cms/resources/js/org/ametys/cms/editor/Tables.i18n.js
===================================================================
--- webapp/cms/plugins/cms/resources/js/org/ametys/cms/editor/Tables.i18n.js	(revision 16107)
+++ webapp/cms/plugins/cms/resources/js/org/ametys/cms/editor/Tables.i18n.js	(working copy)
@@ -1372,7 +1372,10 @@
 	tinyMCE.focus();
 	
 	var parentTable = org.ametys.cms.editor.tables._getTable(tinyMCE.activeEditor.selection.getStart());
+	var parentRow = Ext.get(this._currentCell).parent();
+	
 	var hasCurrentlyAColHeader = parentTable != null && org.ametys.cms.editor.tables._hasColHeader(Ext.get(parentTable));
+	var hasCurrentlyARowHeader = parentTable != null && org.ametys.cms.editor.tables._hasRowHeader(Ext.get(parentTable));
 	
 	tinyMCE.activeEditor.execCommand('mceBeginUndoLevel');
 	tinyMCE.activeEditor.execCommand('mceTableSplitCells');
@@ -1381,6 +1384,16 @@
 	{
 		org.ametys.cms.editor.tables.ToggleColHeader(true);
 	}
+	
+	if (!hasCurrentlyARowHeader && this._currentCell.tagName.toLowerCase() == 'th' && parentRow != null)
+	{
+		// Replace th by td for cells of the splitted row except the first
+		var cells = parentRow.select('th', false);
+		for (var i=1; i < cells.getCount(); i++)
+		{
+			org.ametys.cms.editor.tables._replaceCellWith(Ext.get(cells.elements[i]), 'td');
+		}
+	}
 }
 org.ametys.cms.editor.tables.SplitCellsListener = function(button, target, node)
 {