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JavaScript implementation page content disappears after set time

Source: Internet
Author: User
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Javascript| Timing | page

<HTML>
<HEAD>
<meta http-equiv= ' content-type ' content= ' text/html; charset=gb2312 ' >
<TITLE> a portion of the content displayed on the page will automatically disappear after a set time </TITLE>
</HEAD>
<body >

<script language= "JavaScript1.2" >
adtime=10; Seconds ad Reminder is shown
chancead=1; Ad would be shown the 1 in X times (put 1 for everytime)

var ns= (document.layers);
var ie= (document.all);
var w3= (document.getElementById &&!ie);
adcount=0;
function Initad () {
if (!ns &&!ie &&!w3) return;
if (IE) addiv=eval (' Document.all.sponsorAdDiv.style ');
else if (NS) addiv=eval (' document.layers[' Sponsoraddiv "]);
else if (W3) addiv=eval (' document.getElementById (' Sponsoraddiv '). Style ');
Randad=math.ceil (Math.random () *chancead);
if (ie| | W3)
addiv.visibility= "visible";
Else
Addiv.visibility = "show";
if (randad==1) Showad ();
}
function Showad () {
if (adcount<adtime*10) {adcount+=1;
if (IE) {documentwidth =document.body.offsetwidth/2+document.body.scrollleft-20;
Documentheight =document.body.offsetheight/2+document.body.scrolltop-20;}
else if (NS) {documentwidth=window.innerwidth/2+window.pagexoffset-20;
documentheight=window.innerheight/2+window.pageyoffset-20;}
else if (W3) {documentwidth=self.innerwidth/2+window.pagexoffset-20;
documentheight=self.innerheight/2+window.pageyoffset-20;}
Addiv.left=documentwidth-200;addiv.top =documentheight-200;
SetTimeout ("Showad ()", 100);} else Closead ();
}
function Closead () {
if (ie| | W3)
Addiv.display= "None";
Else
Addiv.visibility = "Hide";
}
Onload=initad;
End-->
</script>
<div id= "Sponsoraddiv" style= "Visibility:hidden" >
<table bgcolor= "#008000" ><tr><td>
<table width= "bgcolor=" "#F0FFF0" ><tr><td align= "center" valign= "Middle" >
<p><b> Web Teaching Network welcome you to visit <br>
Please mention your valuable comments, thank you <br>
Your presence is the greatest support for US .</b>
</p>
<p> (This display area will be automatically closed in a few seconds)
<br>
</td></tr></table></td></tr></table>
</div>

</BODY></HTML>



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