function get_Code(imgid) {
    var CodeFile = "http://www.ctanet.cn/Inc/newCode/code.asp";
    if(document.getElementById(imgid)){
    document.getElementById(imgid).innerHTML = "<img src='" + CodeFile + "?t=" + Math.random() + "' alt='点击刷新验证码' onClick='this.src=" + CodeFile+"?t=" + Math.random() + "' style='cursor:pointer;'>"}
}
function CheckFormIndex(){
    var sf=document.forms["MyLogin"];
    if (sf.UserName.value==""){alert("请输入用户名");sf.UserName.focus();return false;}
    if (sf.Password.value==""){alert("请输入密码");sf.Password.focus();return false;}
}
var str;
str=('<div class="W_980 TopLine">');
str+=('  <div class="floatL colorY">关注纺织助剂行业、关注中国纺织助剂网</div>');
str+=('  <form name="MyLogin" action="http://www.ctanet.cn/User/Login.asp" method="post" onSubmit="return CheckFormIndex();">');
str+=('    <input name="Action" type="hidden" value="Login" />');
str+=('    <div style="float:right;"> 用户名');
str+=('      <input name="UserName"  type="text"  id="UserName" maxlength="20" style="border:#CCC 1px solid;color:#0066CC;width:50px;height:15px;">');
str+=('      密码');
str+=('      <input name="Password"  type="password" id="Password" maxlength="20" style="border:#CCC 1px solid;color:#0066CC;width:50px;height:15px;">');
str+=('      验证码');
str+=('      <input name="verifycode"  type="text"  id="verifycode" maxlength="20" style="border:#CCC 1px solid;color:#0066CC;width:30px;height:15px;" onFocus="get_Code(\'imgidtop\');this.onfocus=null;">');
str+=('      <span id="imgidtop" onClick="get_Code(\'imgidtop\');document.getElementById(\'verifycode\').focus();" style="cursor:pointer; background-color:#FFFFFF; padding:1px;">获取</span>');
str+=('      <input name="Submit" type="image" src="http://www.ctanet.cn/images/sin/login.gif" style="width:41px;height:17px;" />');
str+=('      <a href="http://www.ctanet.cn/User/Reg.asp" ><img src="http://www.ctanet.cn/images/sin/register.gif" width="41" height="17" border="0" alt="注册"/></a> </div>');
str+=('  </form>');
str+=('</div>');
document.getElementById('top_Login').innerHTML = str;