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图片控制内容框的文字上下翻滚

图片控制内容框的文字上下翻滚,JavaScript一款文字滚动特效,Google广告有这种功能。用到网页上也不错,鼠标放到图片上滚动就开始了。
答案:<title>图片控制内容框的文字上下翻滚</title>
<script type="text/javascript">
iens6=document.all||document.getElementById
ns4=document.layers
var speed=1
if (iens6){
document.write('<div id="container" style="position:relative;width:175px;height:160px;border:1px solid black;overflow:hidden">')
document.write('<div id="content" style="position:absolute;width:170px;left:0;top:0">')
}
</script>
<ilayer name="nscontainer" width=175 height=160 clip="0,0,175,160">
<layer name="nscontent" width=175 height=160 visibility=hidden>
<p><font size="2" face="Arial">- DOM stands for Document Object Model</font></p>
<p><font size="2" face="Arial">-</font><font size="2" face="Arial">做了一个简单点的登录框,只是一个无刷新显示/隐藏登录框的实例。希望大家能够喜欢。</font></p>
<p><font size="2" face="Arial">- CSS allows for the separation between content
definition and formatting</font></p>
</layer>
</ilayer>
<script language="JavaScript1.2">
if (iens6)
document.write('</div></div>')
</script>
<table width="175px"><td><p align="right">
<a href="#" onMouseover="moveup()" onMouseout="clearTimeout(moveupvar)"><img src="/jscss/demoimg/200909/arrow-up.png" border=0></a>  <a href="#" onMouseover="movedown()" onMouseout="clearTimeout(movedownvar)"><img src="/jscss/demoimg/200909/arrow-down.png" border=0></a></p></td>
</table>

<script language="JavaScript1.2">
if (iens6){
var crossobj=document.getElementById? document.getElementById("content") : document.all.content
var contentheight=crossobj.offsetHeight
}
else if (ns4){
var crossobj=document.nscontainer.document.nscontent
var contentheight=crossobj.clip.height
}

function movedown(){
if (iens6&&parseInt(crossobj.style.top)>=(contentheight*(-1)+100))
crossobj.style.top=parseInt(crossobj.style.top)-speed+"px"
else if (ns4&&crossobj.top>=(contentheight*(-1)+100))
crossobj.top-=speed
movedownvar=setTimeout("movedown()",20)
}

function moveup(){
if (iens6&&parseInt(crossobj.style.top)<=0)
crossobj.style.top=parseInt(crossobj.style.top)+speed+"px"
else if (ns4&&crossobj.top<=0)
crossobj.top+=speed
moveupvar=setTimeout("moveup()",20)

}

function getcontent_height(){
if (iens6)
contentheight=crossobj.offsetHeight
else if (ns4)
document.nscontainer.document.nscontent.visibility="show"
}
window.onload=getcontent_height
</script>

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