語法說明：

1.在 style="background-color: #FF00FF" 中修改四方條的顏色
2.在 var speed=20 中修改特效的速度，數值越大越快，越小越慢

<!--四方開啟視窗_開始-->
<style>
<!--
.intro{
position:absolute;
left:0;
top:0;
}
-->
</style>
<div id="i1" class="intro" style="background-color: #FF00FF"></div>
<script language="JavaScript">
<!--
var speed=20
if (document.layers){
var reference=window.innerWidth/window.innerHeight
var temp=eval("document.i1.clip")
temp.left=temp.top=0
temp.right=window.innerWidth
temp.bottom=window.innerHeight
}
else if (document.all){
var reference=document.body.clientWidth/document.body.clientHeight
var rightclip,leftclip,topclip,bottomclip
var temp=document.all.i1.style
topclip=leftclip=0
rightclip=temp.width=document.body.clientWidth
bottomclip=temp.height=document.body.clientHeight
}
function doit(){
window.scrollTo(0,0)
if (document.layers){
if (temp.left>window.innerWidth/2)
clearInterval(stopit)
temp.left+=reference*speed
temp.top+=speed
temp.right-=reference*speed
temp.bottom-=speed
}
else if (document.all){
if (leftclip>document.body.clientWidth/2)
clearInterval(stopit)
temp.clip="rect( "+topclip+" "+rightclip+" "+bottomclip+" "+leftclip+")"
leftclip+=reference*speed
topclip+=speed
rightclip-=reference*speed
bottomclip-=speed
}
}
stopit=setInterval("doit()",100)
-->
</script>
<!--四方開啟視窗_結束-->

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