Index: em-format-html-display.c
===================================================================
RCS file: /cvs/gnome/evolution/mail/em-format-html-display.c,v
retrieving revision 1.83
diff -u -r1.83 em-format-html-display.c
--- em-format-html-display.c	1 Jan 2006 13:56:30 -0000	1.83
+++ em-format-html-display.c	11 Jan 2006 16:08:06 -0000
@@ -399,6 +399,20 @@
 	return type;
 }
 
+static gboolean
+efhd_scroll_event(GtkWidget *w, GdkEventScroll *event, EMFormatHTMLDisplay *efhd)
+{
+	if(event->direction == GDK_SCROLL_UP)
+	{
+		gtk_html_zoom_in (efhd->formathtml.html);
+	}
+	else if(event->direction == GDK_SCROLL_DOWN)
+	{
+		gtk_html_zoom_out (efhd->formathtml.html);	
+	}
+	return TRUE;
+}
+
 EMFormatHTMLDisplay *em_format_html_display_new(void)
 {
 	EMFormatHTMLDisplay *efhd;
@@ -409,6 +423,7 @@
 	g_signal_connect(efhd->formathtml.html, "link_clicked", G_CALLBACK(efhd_html_link_clicked), efhd);
 	g_signal_connect(efhd->formathtml.html, "on_url", G_CALLBACK(efhd_html_on_url), efhd);
 	g_signal_connect(efhd->formathtml.html, "button_press_event", G_CALLBACK(efhd_html_button_press_event), efhd);
+	g_signal_connect(efhd->formathtml.html, "scroll_event", G_CALLBACK(efhd_scroll_event), efhd);
 
 	return efhd;
 }