var str; function chkSubmit(form) { if(form.username.value=="") { alert("用户名不能为空!"); return false; } if(form.userpass.value=="") { alert("密码不能为空!"); return false; } if(form.passcode.value=="") { alert("验证码不能为空!"); return false; } return true; } document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write (""); document.write ("
用户名:
密 码:
验证码:
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类 别:
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");