function showPages(name) {
this.name = name;
this.page = 1;
this.pageCount = 1;
this.argName = 'page';
}

showPages.prototype.getPage = function(){ 
var args = location.search;
var reg = new RegExp('[\?&]?' + this.argName + '=([^&]*)[&$]?', 'gi');
var chk = args.match(reg);
this.page = RegExp.$1;
}
showPages.prototype.checkPages = function(){ 
if (isNaN(parseInt(this.page))) this.page = 1;
if (isNaN(parseInt(this.pageCount))) this.pageCount = 1;
if (this.page < 1) this.page = 1;
if (this.pageCount < 1) this.pageCount = 1;
if (this.page > this.pageCount) this.page = this.pageCount;
this.page = parseInt(this.page);
this.pageCount = parseInt(this.pageCount);
}
showPages.prototype.createHtml = function(mode){
var strHtml = '', prevPage = this.page - 1, nextPage = this.page + 1;
if (mode == '' || typeof(mode) == 'undefined') mode = 0;
switch (mode) {

case 2 : 
strHtml += '<span class="count">当前: ' + this.page + '/' + this.pageCount + '</span> ';
strHtml += '<span class="number">';
if (prevPage < 1) {
strHtml += '<span title="First Page">第一页</span> ';
strHtml += '<span title="Prev Page">上一页</span> ';
} else {
strHtml += '<span title="First Page"><a href="javascript:' + this.name + '.toPage(1);">第一页</a> </span> ';
strHtml += '<span title="Prev Page"><a href="javascript:' + this.name + '.toPage(' + prevPage + ');">上一页</a></span> ';
}
if (this.page != 1) strHtml += '<span title="Page 1">[<a href="javascript:' + this.name + '.toPage(1);">1</a>]</span>';
if (this.page >= 5) strHtml += '<span>...</span>';
if (this.pageCount > this.page + 2) {
var endPage = this.page + 2;
} else {
var endPage = this.pageCount;
}
for (var i = this.page - 2; i <= endPage; i++) {
if (i > 0) {
if (i == this.page) {
strHtml += '[<span title="Page ' + i + '" style="color:#FF0000;font-weight:bold">' + i + '</span>]';
} else {
if (i != 1 && i != this.pageCount) {
strHtml += '[<span title="Page ' + i + '"><a href="javascript:' + this.name + '.toPage(' + i + ');">' + i + '</a></span>]';
}
}
}
}
if (this.page + 3 < this.pageCount) strHtml += '<span>...</span>';
if (this.page != this.pageCount) strHtml += '[<span title="Page ' + this.pageCount + '"><a href="javascript:' + this.name + '.toPage(' + this.pageCount + ');">' + this.pageCount + '</a></span>]';
if (nextPage > this.pageCount) {
strHtml += '<span title="Next Page">下一页</span> ';
strHtml += '<span title="Last Page">尾页</span> ';
} else {
strHtml += '<span title="Next Page"><a href="javascript:' + this.name + '.toPage(' + nextPage + ');">下一页</a></span> ';
strHtml += '<span title="Last Page"><a href="javascript:' + this.name + '.toPage(' + this.pageCount + ');">尾页</a></span> ';
}
strHtml += '<input type="text" name="Fastpage" style="text-align:center;width:25px" onkeyup="clearNoNum(this)" /> <input type="button" value="转到" onclick="javascript:pg.toPage(Fastpage.value);" style="height:22px" />';
strHtml += '</span><br />';
break;

default :
strHtml = 'Javascript showPage Error: not find mode ' + mode;
break;
}
return strHtml;
}
showPages.prototype.createUrl = function (page) { 
if (isNaN(parseInt(page))) page = 1;
if (page < 1) page = 1;
if (page > this.pageCount) page = this.pageCount;
var url = location.protocol + '//' + location.host + location.pathname;
var args = location.search;
var reg = new RegExp('([\?&]?)' + this.argName + '=[^&]*[&$]?', 'gi');
args = args.replace(reg,'$1');
if (args == '' || args == null) {
args += '?' + this.argName + '=' + page;
} else if (args.substr(args.length - 1,1) == '?' || args.substr(args.length - 1,1) == '&') {
args += this.argName + '=' + page;
} else {
args += '&' + this.argName + '=' + page;
}
return url + args;
}
showPages.prototype.toPage = function(page){ 
var turnTo = 1;
if (typeof(page) == 'object') {
turnTo = page.options[page.selectedIndex].value;
} else {
turnTo = page;
}
self.location.href = this.createUrl(turnTo);
}
showPages.prototype.printHtml = function(mode){
this.getPage();
this.checkPages();
this.showTimes += 1;
document.write('<div id="pages_' + this.name + '_' + this.showTimes + '" class="pages"></div>');
document.getElementById('pages_' + this.name + '_' + this.showTimes).innerHTML = this.createHtml(mode);
document.getElementById('top_list').innerHTML = document.getElementById('pages_' + this.name + '_' + this.showTimes).innerHTML;
}
showPages.prototype.formatInputPage = function(e){
var ie = navigator.appName=="Microsoft Internet Explorer"?true:false;
if(!ie) var key = e.which;
else var key = event.keyCode;
if (key == 8 || key == 46 || (key >= 48 && key <= 57)) return true;
return false;
}
function clearNoNum(obj)
{
   //�Ȱѷ����ֵĶ��滻�����������ֺ�.
   obj.value = obj.value.replace(/[^\d.]/g,"");
   //���뱣֤��һ��Ϊ���ֶ���.
   obj.value = obj.value.replace(/^\./g,"");
   //��ֻ֤�г���һ��.��û�ж��.
   obj.value = obj.value.replace(/\.{1,}/g,"");
   //��֤.ֻ����һ�Σ����ܳ�����������
   obj.value = obj.value.replace(".","$#$").replace(/\./g,"").replace("$#$",".");
}