語法說明：

1.在 width:1px; 中修改十字線的寬度
2.在 height:1px 中修改十字線的高度
3.在 background-color:#FF0000; 中修改十字線的顏色


<!--十字瞄準線_開始-->
<style>
<!--
#leftright, #topdown{
position:absolute;
left:0;
top:0;
width:1px;/*十字線粗細*/
height:1px;/*十字線粗細*/
layer-background-color:#000000;
background-color:#FF0000;/*十字線色彩*/
z-index:100;
font-size:1px;
}
-->
</style>
<div id="leftright" style="width:expression(document.body.clientWidth-2)"></div>
<div id="topdown" style="height:expression(document.body.clientHeight-2)"></div>
<script language="JavaScript">
<!--
if (document.all&&!window.print){
leftright.style.width=document.body.clientWidth-2
topdown.style.height=document.body.clientHeight-2
}
else if (document.layers){
document.leftright.clip.width=window.innerWidth
document.leftright.clip.height=1
document.topdown.clip.width=1
document.topdown.clip.height=window.innerHeight
}
function followmouse1(){
//move cross engine for IE 4+
leftright.style.pixelTop=document.body.scrollTop+event.clientY+1
topdown.style.pixelTop=document.body.scrollTop
if (event.clientX<document.body.clientWidth-2)
topdown.style.pixelLeft=document.body.scrollLeft+event.clientX+1
else
topdown.style.pixelLeft=document.body.clientWidth-2
}
function followmouse2(e){
//move cross engine for NS 4+
document.leftright.top=e.y+1
document.topdown.top=pageYOffset
document.topdown.left=e.x+1
}
if (document.all)
document.onmousemove=followmouse1
else if (document.layers){
window.captureEvents(Event.MOUSEMOVE)
window.onmousemove=followmouse2
}
function regenerate(){
window.location.reload()
}
function regenerate2(){
setTimeout("window.onresize=regenerate",400)
}
if ((document.all&&!window.print)||document.layers)
//if the user is using IE 4 or NS 4, both NOT IE 5+
window.onload=regenerate2
-->
</script>
<!--十字瞄準線_結束-->

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