fix compose to use the "hidden" attribute since I changed common dialogs last night

mailnews/compose/resources/content/askSendFormat.js

@@ -23,11 +23,11 @@ function Startup()
 		    element.setAttribute("value", labels.getAttribute("button2Label"));
 		    element = document.getElementById("Button2");
 		    element.setAttribute("value", labels.getAttribute("button3Label"));
-		    element.setAttribute("style", "display:inline");
+            element.removeAttribute("hidden");
 		    element.setAttribute("disabled", "true");
 		    element = document.getElementById("Button3");
 		    element.setAttribute("value", labels.getAttribute("button4Label"));
-		    element.setAttribute("style", "display:inline");
+            element.removeAttribute("hidden");
 		    element.setAttribute("disabled", "true");
 		    
 		    //set buttons action
@@ -73,4 +73,4 @@ function Recipients()
 function Help()
 {
     return false;
-}
+}