//换页
function setpage(cmd){
  switch(cmd){
  case 1:
    with (document.Form1){
      if (parseInt(curpage.value)!=1){
        curpage.value=1;
        submit();
      }
    }
    break;
  case 2:
    with (document.Form1){
      if (parseInt(curpage.value)>1){
        curpage.value=parseInt(curpage.value)-1;
        submit();
      }
    }
    break;
  case 3:
    with (document.Form1){
      if (parseInt(curpage.value)<parseInt(countpage.value)){
        curpage.value=parseInt(curpage.value)+1;
        submit();
      }
    }
    break;
  case 4:
    with (document.Form1){
      if (parseInt(curpage.value)!=parseInt(countpage.value)){
        curpage.value=parseInt(countpage.value);
        submit();
      }
    }
    break;
  case 5:
    with (document.Form1){
      if ((parseInt(changepage.value)>parseInt(countpage.value))||(parseInt(changepage.value)<1)){
        alert("对不起，您指定的页码范围无效!请重新指定!");
      }else{         
        curpage.value=parseInt(changepage.value);
        submit();
      }
    }
    break;
  }
}