asp上传带显示的代码

答案：注意是用到了，下列的演示
<script language="JavaScript" type="text/javascript"> 
adTime=8; 
chanceAd=1; 
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-100;adDiv.top =documentHeight-0; 
        setTimeout("showAd()",100);} 
} 
function closeAd(){ 
if (ie||w3) 
adDiv.display="none"; 
else 
adDiv.visibility ="hide"; 
} 
function $(obj){ 
    return document.getElementById(obj); 
} 
function checkForm(){ 
    if($("file1").value != "") 
    { 
                if(/jpg|jpeg|gif|bmp/i.test($("file1").value.match(/\.(\w+)$/)[0]) == false){ 
                    alert("您只能上传图片文件"); 
                    return false; 
                } 
                else 
                { 
                    return true; 
                } 
    } 
    else 
    { 
        alert("您还没有选中需要上传的图片"); 
        return false; 
    } 
}
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