JS实现把鼠标放到链接上出现滚动文字的方法

<div id="tooltip2" style="position:absolute;visibility:hidden;clip:rect(0 150 50 0);width:150px;background-color:seashell"><layer name="nstip" width=1000px bgColor="seashell"></layer></div><SCRIPT language="JavaScript"><!--if (!document.layers&&!document.all)event="test"function showtip2(current,e,text){if (document.all&&document.readyState=="complete"){document.all.tooltip2.innerHTML='<marquee style="border:1px solid black">'+text+'</marquee>'document.all.tooltip2.style.pixelLeft=event.clientX+document.body.scrollLeft+10document.all.tooltip2.style.pixelTop=event.clientY+document.body.scrollTop+10document.all.tooltip2.style.visibility="visible"}else if (document.layers){document.tooltip2.document.nstip.document.write('<b>'+text+'</b>')document.tooltip2.document.nstip.document.close()document.tooltip2.document.nstip.left=0currentscroll=setInterval("scrolltip()",100)document.tooltip2.left=e.pageX+10document.tooltip2.top=e.pageY+10document.tooltip2.visibility="show"}}function hidetip2(){if (document.all)document.all.tooltip2.style.visibility="hidden"else if (document.layers){clearInterval(currentscroll)document.tooltip2.visibility="hidden"}}function scrolltip(){if (document.tooltip2.document.nstip.left>=-document.tooltip2.document.nstip.document.width)document.tooltip2.document.nstip.left-=5elsedocument.tooltip2.document.nstip.left=150}//--> </SCRIPT><a href=# onMouseOver="showtip2(this,event,'看到了吧？')" onMouseOut="hidetip2()">把鼠标放上来试试</a>