lib.js_javascript techniques used in filemanage function

var indexnum= 10;
var count= 0;


function getmap(sFileName,sId){

var Uploadpic="../filetype/unknown.gif";    
var sExten = sFileName.substring(sFileName.lastIndexOf(".") 1,sFileName.length);

var creatediv = document.createElement("div");
creatediv.setAttribute("id","myfile_" sId);
creatediv.style.height = "17px";
creatediv.className = "file_div";

strHtml  = "

" "
strHtml  = ""
strHtml  = "

> "  sFileName  "

strHtml  = " > "  sFileName  "     " strHtml  = " "

creatediv.innerHTML = strHtml ;
document.getElementById("myfilesarea").appendChild(creatediv);
document.getElementById(sId).style.display="none"

count  ;

checkexist(sExten,sId);

}

function checkexist(xExt,xId){
var picurl="../filetype/" xExt ".gif";

var url = "checkexist.asp?pic=" xExt "&pid="  Math.random();

  xmlHttp.open("GET", url, false);
  xmlHttp.onreadystatechange = function sendinfo() {

  if (xmlHttp.readyState == 4) {
     if(xmlHttp.status == 200) {
     var response = xmlHttp.responseText;
    if (response =="yes"){
    document.getElementById('fileext_' xId).src=picurl;
    }
    }
  }
}

xmlHttp.send(null); 


}

     
   function clearfiles(xId){
   document.getElementById("myfile_" xId).removeNode(true);
   document.getElementById(xId).style.display="block";
   count--;
    }




function step1() {
  document.getElementById("step01").innerHTML=" 第一步:更新文件及文件夹"
  var url = "../listall.asp?pid=" Math.random();
  xmlHttp.open("GET", url, true);
  xmlHttp.onreadystatechange = step1ok;
  xmlHttp.send(null);  
}

function step1ok() {
  if (xmlHttp.readyState == 4) {
  document.getElementById("step01").innerHTML="  第一步:更新文件及文件夹 "
  document.getElementById("step02").innerHTML=" 第二步:删除无效的文件"
  setTimeout("step2()",1000);
  }
}

function step2() {
  var url = "../delall.asp?pid=" Math.random();
  xmlHttp.open("GET", url, true);
  xmlHttp.onreadystatechange = step2ok;
  xmlHttp.send(null);  
}

function step2ok() {
  if (xmlHttp.readyState == 4) {
    document.getElementById("step02").innerHTML="  第二步:删除无效的文件  "
    document.getElementById("step03").innerHTML=" 第三步:设置FTP空间同步"
    setTimeout("step3()",1000);
  }
}

function step3() {
  var url = "ftpformate.asp?pid=" Math.random();
  xmlHttp.open("GET", url, true);
  xmlHttp.onreadystatechange = step3ok;
  xmlHttp.send(null);  
}

function step3ok() {
  if (xmlHttp.readyState == 4) {
    document.getElementById("step03").innerHTML="  第三步:设置FTP空间同步 "
     setTimeout("step4()",1000);
  }
}

function step4() {
    document.getElementById("filemanage_update").style.display="none"
    document.getElementById("filemanage_all").style.display="block";
    showfiles();
}


var tagstate;
tagstate="no"

function showtag(){
if (tagstate=="no"){
document.getElementById("arror_01").src='images/arror2.gif'
document.getElementById("intro").style.display="block";
tagstate="yes";
}else{
document.getElementById("arror_01").src='images/arror.gif'
document.getElementById("intro").style.display="none";
tagstate="no";
}
}

function showtips(a){
document.getElementById("layer_tips").innerHTML=a
document.getElementById("layer_tips").style.display="block";
document.getElementById("layer_tips").style.pixelTop=window.event.y 18;
document.getElementById("layer_tips").style.pixelLeft=window.event.x 12;
}

function notips(){
document.getElementById("layer_tips").style.display="none";
}

function showfileintro(a,b,c, d,e,f){
var count
if(f==''){
count=0
}else{
count=f
}
var htmlstr="File name:" a "
" "Directory where the file is located:" b "
" "File size:" c "
" "Upload time:" d "
" "File introduction :" e "
" "Number of file downloads:" count "
"
document.getElementById("layer_fileintro").innerHTML=htmlstr
document.getElementById("layer_fileintro").style.display ="block";
document.getElementById("layer_fileintro").style.pixelTop=window.event.y 18;
document.getElementById("layer_fileintro").style.pixelLeft=window.event.x 12 ;
}

function nofileintro(){
document.getElementById("layer_fileintro").style.display="none";
}