var xmlHttp = false;

try {
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e2) {
xmlHttp = false;
}
} 


function page1(){
  if(curpage>1){
     curpage=1;
     gopage(curpage);
  }else{
    alert("已到首页");
  }
 }

function page2(){
  if(curpage>1){
     curpage=curpage-1;
     gopage(curpage);
  }else{
    alert("已到首页");
  }
}

function page3(){
  if(curpage<sumpage){
     curpage=curpage+1;
     gopage(curpage);
  }else{
    alert("已到尾页");
  }
}

function page4(){
  if(curpage<sumpage){
     curpage=sumpage;
     gopage(curpage);
  }else{
    alert("已到尾页");
  }
}

function callServer(thepageurl) {
var url=thepageurl;
xmlHttp.open("GET", url, true);
xmlHttp.onreadystatechange = updatePage;
xmlHttp.send(null);
}

function updatePage() {
if (xmlHttp.readyState == 4) {
var response = xmlHttp.responseText;
window.pagemsg.innerHTML=response;
window.pagenumber.innerHTML=curpage;
}

}