網站頁面漂浮廣告js代碼

<div id="ad" style="position:absolute">
<a href="HTTP://www.jzread.com/" target="_blank">
<img src="HTTP://www.jzread.com/skin/default/imga/w300ad.gif" border="0">
</a>
</div>
<script>
var x = 300,y = 144
var xin = true, yin = true
var step = 1
var delay = 10
va r obj=document.getElementById("ad")
function floatAD() {
var L=T=0
var R= document.body.clientWidth-obj.off setWidth
var B = document.body.clientHeight-obj.offsetHeight
obj.style.left = x + document.body.scrollLeft
obj.style.top = y + document.body.scrollTop
x = x + step*(xin?1:-1)
if (x < L) { xin = true; x = L}
if ( x > R){ xin = false; x = R}
y = y + step*(yin?1:-1)
if (y < T) { yin = true; y = T }
if (y > B) { yin = false; y = B }
}
var itl= setInterval("floatAD()", delay)
obj.onmouseover=function(){clearInterval(itl)}
obj. onmouseout=function(){itl=setInterval("floatAD()", delay)}
</script>
<SCRIPT language=JavaScript>
<!--
if( self.name=='main') top.location = "index.php";

var AlertInput = "請輸入:nn";
function Login(form){
var mesg = "";
if(form.log_user.value == "") mesg += "使用者n";
if(form.log_pwd.value == "") mesg += "密碼n";
if(mesg != ""){
mesg = AlertInput + mesg;
alert(mesg);
return false;
}
form.submit();
}

function chk_EnterKey(form){
if(window.event.keyCode==13){
Login(form);
}
}
-->
</SCRIPT>