Added 'try it' usage instructions

scripts/ui.js

@@ -65,6 +65,12 @@
                 .attr( 'id', 'trybox' )
                 .hide()
                 .append( $( '<h2>' ).text( 'Try ease.js' ) )
+                .append( $( '<p>' ).html(
+                    "Enter or modify a test script below. The common " +
+                    "ease.js modules, such as <tt>Class</tt>, have " +
+                    "already imported for you. When you are ready, click " +
+                    "<strong>Run</strong> to run the script."
+                ) )
                 .append( $txt = $( '<textarea>' ).text (
                     "console.log( Class( 'Foo', {} ) );"
                 ) )

style.css

@@ -221,7 +221,7 @@ p.copyright a, p.copyright a:link {
 }
 
 #trybox h2 {
-  margin: 0px 0px 1em 0px;
+  margin: 0px;
 }
 
 #trybox textarea {