function Check() { if(document.LOgin.username.value.length==0){ alert('请输入用户名'); document.LOgin.username.focus(); return false; } if(document.LOgin.password.value.length==0){ alert('请输入密码'); document.LOgin.password.focus(); return false; } } document.writeln(""); document.writeln("
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<\/td>"); document.writeln(" <\/a><\/td>"); document.writeln(" <\/tr>"); document.writeln("
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<\/td>"); document.writeln(" <\/tr>"); document.writeln("
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<\/a><\/td>"); document.writeln("  注册<\/td>"); document.writeln(" <\/tr><\/form>"); document.writeln(" <\/table>"); document.writeln("
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