Size You can set the size of the menu in pixels.
Image Navigation Use images for icons, backgrounds of items. Using images you can create menus entirely based on graphics.
Now let's set the submenu buttons web-behavior. That is, set their Link properties. To set the submenu link, select the submenu item by clicking it and then enter the link address in the "Link" field on the Properties toolbox.
Another way to set the submenu's link is to select it and then click the "Select page" button on the Properties toolbox. Open dialog will appear, in which you can select the page you would like to link to. This page's address will then appear in the "Link" field.
Also, you can assign link target attributes for each submenu item. This will define where a linked page will be opened in your Web-browser. For example "_blank" attribute will open the linked page in new browser window. Note that link target attribute act exactly like the Target attribute of the <a> tag in HTML. To set submenu link target attribute, just select the submenu item and then either choose one of the predefined values from the "Link target attributes" list on the Properties toolbox or enter your own value (window/frame name, where the linked page should be opened). Learn more about link target attributes from the user guide.