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This setting specifies a line of text that browsers will display in lieu of the picture file. This might occur because the Web visitor has turned off the display of pictures, or because the picture is still downloading. Some browsers also dis play this text as a ToolTip when the mouse pointer is over the picture. The Text setting involves two controls: a check box and a text box. If you clear the check box, the browser will receive no alternative text. If you select the check box but don t specify any text, the browser receives an empty string. If you select the check box and specify text, the browser receives that text. This field specifies a URL that contains more information about the current picture. This URL appears, for example, in the dialog box that opens when you right-click a picture in Netscape Navigator 7 and choose Prop erties from the shortcut menu. The Web visitor can click the link to get the addi tional information. If you want to specify a Long Description URL but don t want to type it, click the associated Browse button.

This section establishes a hyperlink to another location from any part of the current picture that has no hotspot defined. This command isn t available for background pictures.

10 For more information about normal and hotspot hyperlinks, refer to Creating and Managing Hyperlinks, on page 291.

This field contains the URL that the browser will retrieve when the Web visitor clicks the current picture. You can use the Browse button to locate it.

This field specifies the frame in which the Location page will appear. It can also specify that the linked page should appear in a new browser window. To enter a value, either type it in the text box or click the Change Target Frame button. The value that makes a page appear in a new window is _blank.

For more information about using the Change Target Frame dialog box, refer to Creating and Modifying Frames Pages, on page 405.

Click this button if the browser should transmit query string parameters to the Web server whenever the browser requests the specified pic ture. FrontPage displays the Hyperlink Parameters dialog box, shown in Figure 10-19, where you can add, modify, remove, or clear such parameters.

Figure 10-19. This dialog box creates, modifies, and deletes keyword=value expressions appended to a URL by means of a query string.

There are at least two scenarios where this might be necessary: First, if the picture source specifies not an ordinary GIF or JPEG file, but rather a program that runs on the Web server and generates a picture file on the fly. Many such programs and hit counters in particular use query string parameters to control their results. Second, if you re displaying pictures (such as banner ads) that certain Internet advertising sites provide, you might need to specify parameters in order to get paid.

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If you know anything about ASP, the dialog box shown in Figure 10-19 creates quite a dilemma. An ASP page is usually a special Web page that contains not only HTML, but also special script code that runs on the Web server. The script code accesses databases, files, or other resources available on the server and uses this information to customize the HTML each Web visitor receives. The nwpic.asp file referenced in Figure 10-19 is a special ASP page that sends the browser a picture in bitmap (BMP) format rather than a Web page in HTML format. Specifically, the picture is a photo of an employee in the ubiquitous Northwind Traders database. The following HTML tag displays the photo for employee number 5: