var dom = (document.getElementsByTagName) ? true : false;
var ie5 = (document.getElementsByTagName && document.all) ? true : false;
var arrowUp, arrowDown;

if (ie5 || dom)
	initSortTable();

function initSortTable() {
	arrowUp = document.createElement("SPAN");
	var tn = document.createTextNode("↓");
	arrowUp.appendChild(tn);
	arrowUp.className = "arrow";

	arrowDown = document.createElement("SPAN");
	var tn = document.createTextNode("↑");
	arrowDown.appendChild(tn);
	arrowDown.className = "arrow";
}



function sortTable(tableNode, nCol, bDesc, sType) {
	var tBody = tableNode.tBodies[0];
	var trs = tBody.rows;
	var a = new Array();
	
	for (var i=0; i<trs.length; i++) {
		a[i] = trs[i];
	}
	
	a.sort(compareByColumn(nCol,bDesc,sType));
	
	for (var i=0; i<a.length; i++) {
		tBody.appendChild(a[i]);
	}
}

function CaseInsensitiveString(s) {
	return String(s).toUpperCase();
}

function parseDate(s) {
	return Date.parse(s.replace(/\-/g, '/'));
}

/* alternative to number function
 * This one is slower but can handle non numerical characters in
 * the string allow strings like the follow (as well as a lot more)
 * to be used:
 *    "1,000,000"
 *    "1 000 000"
 *    "100cm"
 */

function toNumber(s) {
    return Number(s.replace(/[^0-9\.]/g, ""));
}

function compareByColumn(nCol, bDescending, sType) {
	var c = nCol;
	var d = bDescending;
	
	var fTypeCast = String;
	
	if (sType == "Number")
		fTypeCast = Number;
	else if (sType == "Date")
		fTypeCast = parseDate;
	else if (sType == "CaseInsensitiveString")
		fTypeCast = CaseInsensitiveString;

	return function (n1, n2) {
		if (fTypeCast(getInnerText(n1.cells[c])) < fTypeCast(getInnerText(n2.cells[c])))
			return d ? -1 : +1;
		if (fTypeCast(getInnerText(n1.cells[c])) > fTypeCast(getInnerText(n2.cells[c])))
			return d ? +1 : -1;
		return 0;
	};
}


function sortColumn(e) {

	var tmp, el, tHeadParent;

	if (ie5)
		tmp = e.srcElement;
	else if (dom)
		tmp = e.target;

	tHeadParent = getParent(tmp, "THEAD");
	el = getParent(tmp, "TD");

	if (tHeadParent == null)
		return;
		
	if (el != null) {
		var p = el.parentNode;
		var i;

		if (el._descending)	// catch the null
			el._descending = false;
		else
			el._descending = true;
		
		if (tHeadParent.arrow != null) {
			if (tHeadParent.arrow.parentNode != el) {
				tHeadParent.arrow.parentNode._descending = null;	//reset sort order		
			}
			tHeadParent.arrow.parentNode.removeChild(tHeadParent.arrow);
		}

		if (el._descending)
			tHeadParent.arrow = arrowDown.cloneNode(true);
		else
			tHeadParent.arrow = arrowUp.cloneNode(true);

		el.appendChild(tHeadParent.arrow);

			

		// get the index of the td
		for (i=0; i<p.cells.length; i++) {
			if (p.cells[i] == el) break;
		}

		var table = getParent(el, "TABLE");
		// can't fail
		
		sortTable(table,i,el._descending, el.getAttribute("type"));
	}
}


function getInnerText(el) {
	if (ie5) return el.innerText;	//Not needed but it is faster
	
	var str = "";
	
	for (var i=0; i<el.childNodes.length; i++) {
		switch (el.childNodes.item(i).nodeType) {
			case 1: //ELEMENT_NODE
				str += getInnerText(el.childNodes.item(i));
				break;
			case 3:	//TEXT_NODE
				str += el.childNodes.item(i).nodeValue;
				break;
		}
		
	}
	
	return str;
}

function getParent(el, pTagName) {
	if (el == null) return null;
	else if (el.nodeType == 1 && el.tagName.toLowerCase() == pTagName.toLowerCase())	// Gecko bug, supposed to be uppercase
		return el;
	else
		return getParent(el.parentNode, pTagName);
}
function IsSoundFile(ext) {
            var types = ",aif,aiff,au,mid,midi,rmi,snd,wav,mp3,m3u,";
            var temp = ","+ext+",";
            return types.indexOf(temp) > -1;
        }
function IsimgFile(ext) {
            var types = ",jpg,bmp,gif,png,";
            var temp = ","+ext+",";
            return types.indexOf(temp) > -1;
        }
function IsMovieFile(ext) {
            var types = ",asf,avi,m1v,mov,mp2,mpa,mpe,mpeg,mpg,mpv2,qt,asx,";
            var temp = ","+ext+",";
            return types.indexOf(temp) > -1;
        }
function IsrmFile(ext) {
            var types = ",rm,ram,ra,";
            var temp = ","+ext+",";
            return types.indexOf(temp) > -1;
        }
function IsflashFile(ext) {
            var types = ",swf,";
            var temp = ","+ext+",";
            return types.indexOf(temp) > -1;
        }
function IsappFile(ext) {
            var types = ",exe,com,rar,zip";
            var temp = ","+ext+",";
            return types.indexOf(temp) > -1;
        }
function myfile(){
var o=event.srcElement;
id=o.id;
path=o.path;
ffname=o.fname;
altt=o.al;
ftype=o.type;
ext=o.ext;
f=o.ff;
size=o.size;
                            fname.innerHTML ='<b>'+ffname+'.'+ext+'</b><br>'+ftype;
		txt.innerHTML="<a href=file.asp?id="+id+" target='_blank' style='color:black'>详细信息</a><br><a href="+path+" target='_blank' style='color:black'>下载文件</a><br><a href="+f+".asp?id="+id+" target='_blank' style='color:black'>修改文件</a><br><a href=# style='color:black' title='桌面快捷方式' onclick=window.open('fileshortcut.asp?id="+id+"','','top=10,left=10,width=10,height=10')>快捷方式</a>";
		al.innnerHTML=altt;
if (IsSoundFile(ext)){
                            Preview.innerHTML = '<p>' +
                                '<object  ID=MediaPlayer class=Sound classid="clsid:22D6F312-B0F6-11D0-94AB-0080C74C7E95" width="195" height="45">' +
                                    '<param name="ShowDisplay" value="false">'+
                                    '<param name="AutoPlay" value="false">' +
                                '</object>';
                            MediaPlayer.EnableContextMenu = true;
                            MediaPlayer.Open(path);}
else if (IsMovieFile(ext)){
                            Preview.innerHTML = '<p>' +
                                '<object  ID=MediaPlayer class=Sound classid="clsid:22D6F312-B0F6-11D0-94AB-0080C74C7E95"  width="195" height="236">' +
                                    '<param name="ShowDisplay" value="false">'+
                                    '<param name="AutoPlay" value="false">' +
                                '</object>';
                            MediaPlayer.EnableContextMenu = true;
                            MediaPlayer.Open(path);}
else if (IsrmFile(ext)){
Preview.innerHTML ='<embed console="Clip1" controls="ImageWindow" type="audio/x-pn-realaudio-plugin" width="192" height="156" src='+path+'></embed><embed src='+path+' type="audio/x-pn-realaudio-plugin"  type="audio/x-pn-realaudio-plugin" console="Clip1" controls="ControlPanel,StatusBar" height="60" width="195" autostart="false"></embed>'}
else if (IsimgFile(ext)){
                            Preview.innerHTML = '<div style="background-color: #999999; border: 1 solid #000080; padding: 2"><p align=center>' +
                                '<img width="150" alt='+altt+' onclick=open("viewimg.asp?id='+id+'","","top=0,left=0,width=50,height=50")  src='+path+'></div><div style="background-color: #FFFFE1; border: 1 solid #000080; padding: 2">'+altt+'</div></div>' ;}
else if (IsappFile(ext)){
                            Preview.innerHTML = '程序文件：' +
                                '大小:'+size;}
else if (IsflashFile(ext)){
		Preview.innerHTML ='<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=5,0,0,0" width="195" height="180">'+
'<param name=movie value='+path+'>'+
'<param name=quality value=high>'+
'<embed src='+path+' quality=high pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="195" height="236">'+
'</embed>'+
'</object>' ;}
else {
                            Preview.innerHTML = '<div style="background-color: #EEEEEE; border: 1 solid #000000; ;table-layout:fixed;word-break:break-all">'+altt+'.........</div>';}
}
function halt()
{fname.innerText='';
Preview.innerText='选定项目查看说明！';
txt.innerText='';
al.innnerHTML='<a href="search.asp">站内搜索</a>';}
function Show(divid) { 
divid.style.visibility = "visible"; 
divid.style.left=window.event.x+15;
divid.style.top=window.event.y+document.body.scrollTop-10;
var o=event.srcElement;
ftype=o.type;
ffname=o.fname;
divid.innerHTML="名称:"+ffname+"<br>类型:"+ftype;
} 
function Hide(divid) { 
divid.style.visibility = "hidden"; 
}