<script>
tim=1
//每0.1s tim++
setInterval("tim++",100)
b=1

var autourl=new Array()
autourl[1]="www.cnblogs.com"
autourl[2]="www.cnblogs.com/zhangjidong"
autourl[3]="www.cctv.com"
autourl[4]="www.sina.com.cn"

function butt(){
	document.write("<form name=autof>")
	for(var i=1;i<autourl.length;i++)
		document.write("<input type=text name=txt"+i+" size=10 value=测试中……> =》<input type=text name=url"+i+" size=40> =》<input type=button value=GO onclick=window.open(this.form.url"+i+".value)><br>")
	document.write("<input type=submit value=刷新></form>")
}

butt()

function auto(url){
	document.forms[0]["url"+b].value=url
	if(tim>200)
	{
		document.forms[0]["txt"+b].value="链接超时"
	}
	else
	{
		document.forms[0]["txt"+b].value="时间"+tim/10+"秒"
	}
	b++
}

function run()
{
	for(var i=1;i<autourl.length;i++)
	document.write("<img src=http://"+autourl[i]+"/"+Math.random()+" width=1 height=1 onerror=auto('http://"+autourl[i]+"')>")
}

run()
</script>