fix for #2658, allow the user to set the mailnews start page via prefs.

I'm re-using some of the js in PrefWindow.js to do this, since it very much like
setting the users home page. a=sdagley

suite/common/pref/pref-navigator.xul

@@ -71,8 +71,8 @@
 			<html:input name="homepage" type="text"	id="pref:string:browser.startup.homepage" size="30" /> 
 			<html:div>
 				<spring flex="100%"/>
-				<titledbutton class="dialog push" name="starts" type="button" value="&useCurrent;" onclick="SetHomePageToCurrentPage();" />
-				<titledbutton class="dialog push" name="browse" type="button" value="&browseFile;" onclick="PrefNavSelectFile()"/>
+				<titledbutton class="dialog push" name="starts" type="button" value="&useCurrent;" onclick="SetPrefToCurrentPage('pref:string:browser.startup.homepage');" />
+				<titledbutton class="dialog push" name="browse" type="button" value="&browseFile;" onclick="PrefNavSelectFile('pref:string:browser.startup.homepage')"/>
 			</html:div>		
 		</html:fieldset>  
 

xpfe/components/prefwindow/resources/content/PrefsWindow.js

@@ -89,9 +89,11 @@ function openit()  {
          toolkit.CloseWindow( window );
  }
  
- function SetHomePageToCurrentPage()
+ function SetPrefToCurrentPage(prefID)
  {
- 	dump("SetHomePageToCurrentPage() \n ");
+ 	dump("SetPrefToCurrentPage("+ prefID +") \n ");
+	if ((prefID == null) || (prefID == "")) return;
+	
  	var windowManager = Components.classes['component://netscape/rdf/datasource?name=window-mediator'].getService();
 	var	windowManagerInterface = windowManager.QueryInterface( Components.interfaces.nsIWindowMediator);
 
@@ -99,7 +101,7 @@ function openit()  {
 	var topWindowOfType = windowManagerInterface.GetMostRecentWindow( "navigator:browser" );
 	if ( topWindowOfType )
 	{
-		var inputfield = document.getElementById("pref:string:browser.startup.homepage");
+		var inputfield = document.getElementById(prefID);
 		dump( "window found "+inputfield+"\n");
 		if ( inputfield )
 		{
@@ -118,12 +120,12 @@ function createInstance( progid, iidName ) {
   return Components.classes[ progid ].createInstance( iid );
 }
 
-function PrefNavSelectFile() {
+function PrefNavSelectFile(prefID) {
     // Get filespecwithui component.            
     var fileSpec = createInstance( "component://netscape/filespecwithui", "nsIFileSpecWithUI" );
     try {
         var url = fileSpec.chooseFile( "" );
-        var field = document.getElementById( "pref:string:browser.startup.homepage" );
+        var field = document.getElementById(prefID);
         field.setAttribute( "value", fileSpec.nativePath );
     }
     catch( exception ) {

xpfe/components/prefwindow/resources/content/pref-navigator.xul

@@ -71,8 +71,8 @@
 			<html:input name="homepage" type="text"	id="pref:string:browser.startup.homepage" size="30" /> 
 			<html:div>
 				<spring flex="100%"/>
-				<titledbutton class="dialog push" name="starts" type="button" value="&useCurrent;" onclick="SetHomePageToCurrentPage();" />
-				<titledbutton class="dialog push" name="browse" type="button" value="&browseFile;" onclick="PrefNavSelectFile()"/>
+				<titledbutton class="dialog push" name="starts" type="button" value="&useCurrent;" onclick="SetPrefToCurrentPage('pref:string:browser.startup.homepage');" />
+				<titledbutton class="dialog push" name="browse" type="button" value="&browseFile;" onclick="PrefNavSelectFile('pref:string:browser.startup.homepage')"/>
 			</html:div>		
 		</html:fieldset>