点此处秒后立即下载_表单特效

<form name="agree"><td align="center" valign="middle" bgcolor="#FFFFFF"> <b>正 在 连 接 下 载 中 <span id="BT"></span></b> <input name="agreeb" type="button" class="buttonface" onclick="javascript:top.location='../down2.asp?id=7596&no=1'" value="点此处(15 秒后)立即下载"> <script language="javascript"> <!-- var secs = 15; document.agree.agreeb.disabled=true; for(i=1;i<=secs;i++) { window.setTimeout("update(" + i + ")", i * 1000); } function update(num) { if(num == secs) { document.agree.agreeb.value =" 点 此 处 立 即 下 载 "; document.agree.agreeb.disabled=false; BTDownLink.innerHTML="<a href='../down2.asp?id=7596&no=1'> "; } else { printnr = secs-num; document.agree.agreeb.value = "点此处(" + printnr +" 秒后立即下载)"; BT.innerHTML=BT.innerHTML+"."; } } //--> </script><span id="BTDownLink"></span><br><input onclick="runEx('runcode53976')" type="button" value="运行代码"> <input onclick="doCopy('runcode53976')" type="button" value="复制代码"> <input onclick="doSave(runcode53976)" type="button" value="保存代码">[Ctrl+A 全选 注:<a href="http://www.jb51.net/article/23421.htm" title="查看具体详情" target="_blank">如需引入外部Js需刷新才能执行</a>] </td></form>