// 复制文本
function copyText(obj) 
{
var rng = document.body.createTextRange();rng.moveToElementText(obj);rng.scrollIntoView();rng.select();rng.execCommand("Copy");rng.collapse(false);
}
//改变字体大小
function change_size(strt)
{
  var font_size=14;
  switch (strt)
  {
    case 'big':
      font_size=16;
      break;
    case 'normal':
      font_size=14;
      break;
    case 'small':
      font_size=12;
      break;
  }
  document.all.remark_view.style.fontSize=font_size+'px';
}