添加一段脚本程序
<script language=C#>
        private void mouseover()
        {
        this.style.backgroundColor="#00ff00";
return;
        }
                     private void mouseout()
                      {
                       this.style.fontsize="48";
return;
                      }
</script>
然后在标题标签里写：
<H1 id=id onmouseover=mouseover onmouseout=mouseout>标题</H1>