Hello,

Regrettably, this feature isn't natively supported by Kentico. However you can achieve the mentioned effect with some javascript. Or you can use the following approch to create a custom search box and take the search values from it instead of the standard textbox:

<INPUT type="text" value="Search" onfocus="if
(this.value==this.defaultValue) this.value='';">

The smart search box is located here:

\CMSWebParts\SmartSearch\SearchBox.ascx

Best regards,
Boris Pocatko

You can utilize the ASP.NET Ajax Control Toolkit.
For start you must create a new custom layout for the search box web part.
You will then identify the id of the text box control and add the following code:

<ajaxToolkit:TextBoxWatermarkExtender ID="TBWE2" runat="server"
TargetControlID="textBoxSearch"
WatermarkText="Search..."
WatermarkCssClass="watermark_class" />