document.write("<form name=login method=post action=/usercenter/UserLogin.php >")
 document.write("<font color=#ffffff>用户名：</font><input name='UserEmail' type='text' />")
  document.write("<font color=#ffffff>密码：</font><input name='UserPass' type='password' />")
  document.write("<input type=submit value=登录 />")
  document.write("<a href='/usercenter/reg.php'><font color='#FFFFFF'>注册</font></a>" );
  document.write("</form>")