<html xmlns="http://www.w3.org/1999/xhtml">

 <head runat="server">

     <title>欢迎新同学到来</title>

     <script type="text/javascript">

         function scroll() {

             var title = document.title;

             var leftstr = title.charAt();

             var rightstr = title.substring(, title.length);

             document.title = rightstr + leftstr;

         }

         setInterval("scroll()", );

     </script>

 </head>

 <body>

 </body>

 </html>

 <html xmlns="http://www.w3.org/1999/xhtml">

 <head>

     <title>欢迎新同事到来！</title>

     <script type="text/javascript">

         var leftStr;

         var rightStr;

         var getDirection;

         function strMove(direction) {

             this.getDirection = direction;

             var title = document.title;

             getTitleStr(title);

         }

         //拼接向左和向右的字符串

         function getTitleStr(title) {

             if (getDirection == "left") {

                 leftStr = title.charAt();

                 rightStr = title.substring(, title.length);

                 document.title = rightStr + leftStr;

             } else {

                 leftStr = title.charAt(title.length - );

                 rightStr = title.substring(, title.length - );

                 document.title = leftStr + rightStr;

             }

         }

         //停止滚动

         function stopScoll() {

             if (getDirection == "left")

                 clearInterval(intervalLeftId);

             else

                 clearInterval(intervalRightId);

         }

     </script>

 </head>

 <body>

     <input type="button" value="向左滚动" onclick="intervalLeftId = setInterval('strMove(\'left\')',500)" />

     <input type="button" value="停止滚动" onclick = "stopScoll()" />

     <input type="button" value="向右滚动" onclick = "intervalRightId = setInterval('strMove(\'right\')',500)" />

 </body>

 </html>