网页文字左右不间断滚动js代码

<style type="text/css">  #gongao{width:1000px;height:30px;overflow:hidden;line-height:30px;font-size:13px;font-family:'宋体';background:#DDE5ED;color:#0C77CF;font-weight:bold;}  #gongao #scroll_begin, #gongao #scroll_end{display:inline}  </style>  <script type="text/javascript">  function ScrollImgLeft(){  var speed=50;  var scroll_begin = document.getElementById("scroll_begin");  var scroll_end = document.getElementById("scroll_end");  var scroll_div = document.getElementById("scroll_div");  scroll_end.innerHTML=scroll_begin.innerHTML;  function Marquee(){  if(scroll_end.offsetWidth-scroll_div.scrollLeft<=0)  scroll_div.scrollLeft-=scroll_begin.offsetWidth;  else  scroll_div.scrollLeft++;  }  var MyMar=setInterval(Marquee,speed);  scroll_div.onmouseover=function() {clearInterval(MyMar);}  scroll_div.onmouseout=function() {MyMar=setInterval(Marquee,speed);}  }  </script>  <div id="gongao">  <div style="width:900px;height:30px;margin:0 auto;white-space: nowrap;overflow:hidden;" id="scroll_div" class="scroll_div">  <div id="scroll_begin">  ${affiche.content} ${affiche.content} ${affiche.content}  ${affiche.content} ${affiche.content} ${affiche.content}  </div>  <div id="scroll_end"></div>  </div>  <script type="text/javascript">ScrollImgLeft();</script>  </div>