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网页编程－随滚动条移动的层

<div id="Javascript.Div1" class="div" style="width: 240; height:90" align="center">正中...</div>
<SCRIPT LANGUAGE="JavaScript">
function sc1(){
	document.getElementById("Javascript.Div1").style.top=document.body.scrollTop+(document.body.clientHeight-document.getElementById("Javascript.Div1").offsetHeight)/2
	document.getElementById("Javascript.Div1").style.left=document.body.scrollLeft+(document.body.clientWidth-document.getElementById("Javascript.Div1").offsetWidth)/2;
}
</SCRIPT>

<div id="Javascript.Div2" class="div" style="width: 240; height:90;" align="center">左上...</div>
<SCRIPT LANGUAGE="JavaScript">
function sc2(){
	document.getElementById("Javascript.Div2").style.top=document.body.scrollTop
	document.getElementById("Javascript.Div2").style.left=document.body.scrollLeft;
}
</SCRIPT>

<div id="Javascript.Div3" class="div" style="width: 240; height:90;" align="center">左下...</div>
<SCRIPT LANGUAGE="JavaScript">
function sc3(){
	document.getElementById("Javascript.Div3").style.top=document.body.scrollTop+document.body.clientHeight-document.getElementById("Javascript.Div3").offsetHeight;
	document.getElementById("Javascript.Div3").style.left=document.body.scrollLeft;
}
</SCRIPT>

<div id="Javascript.Div4" class="div" style="width: 240; height:90;" align="center">右上...</div>
<SCRIPT LANGUAGE="JavaScript">
function sc4(){
	document.getElementById("Javascript.Div4").style.top=document.body.scrollTop;
	document.getElementById("Javascript.Div4").style.left=document.body.scrollLeft+document.body.clientWidth-document.getElementById("Javascript.Div4").offsetWidth;
}
</SCRIPT>

<div id="Javascript.Div5" class="div" style="width: 240; height:90;" align="center">右下...</div>
<SCRIPT LANGUAGE="JavaScript">
function sc5(){
	document.getElementById("Javascript.Div5").style.top=document.body.scrollTop+document.body.clientHeight-document.getElementById("Javascript.Div5").offsetHeight;
	document.getElementById("Javascript.Div5").style.left=document.body.scrollLeft+document.body.clientWidth-document.getElementById("Javascript.Div5").offsetWidth;;
}
</SCRIPT>