// JScript 

function showPages(name) { //init
    this.name = name;      //object
    this.page = 1;         //currpage
    this.pageCount = 1;    //totalpage
    this.argName = 'page'; //parme
    this.showTimes = 1;    //print
}

showPages.prototype.getPage = function(){ //from urlthe page
    var args = location.search;
    var reg = new RegExp('[\?&]?' + this.argName + '=([^&]*)[&$]?', 'gi');
    var chk = args.match(reg);
    this.page = RegExp.$1;
}
showPages.prototype.checkPages = function(){ //curr page total page
    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(){ //create html code
    var strHtml = '', prevPage = this.page - 1, nextPage = this.page + 1;
            strHtml += '<span class="count">当前第 ' + this.page + '页 / 共' + this.pageCount + '页&nbsp;</span>';
            strHtml += '<span class="number">';
            if (prevPage < 1) {
                strHtml += '<span title="首页">&#171;</span>';
                strHtml += '<span title="前一页">&#139;</span>';
            } else {
                strHtml += '<span title="首页"><a href="javascript:' + this.name + '.toPage(1);">首页</a>&nbsp;</span>';
                strHtml += '<span title="前一页"><a href="javascript:' + this.name + '.toPage(' + prevPage + ');">前一页</a>&nbsp;</span>';
            }
            if (this.page % 10 ==0) {
                var startPage = this.page - 9;
            } else {
                var startPage = this.page - this.page % 10 + 1;
            }
            if (startPage > 10) strHtml += '<span title="前十页"><a href="javascript:' + this.name + '.toPage(' + (startPage - 1) + ');">前10页</a>&nbsp;</span>';
            for (var i = startPage; i < startPage + 10; i++) {
                if (i > this.pageCount) break;
                if (i == this.page) {
                    strHtml += '<span title="第' + i + '页">' + i + '&nbsp;</span>';
                } else {
                    strHtml += '<span title="第' + i + '页"><a href="javascript:' + this.name + '.toPage(' + i + ');">' + i + '</a>&nbsp;</span>';
                }
            }
            if (this.pageCount >= startPage + 10) strHtml += '&nbsp;<span title="后10页"><a href="javascript:' + this.name + '.toPage(' + (startPage + 10) + ');">后10页</a>&nbsp;</span>';
            if (nextPage > this.pageCount) {
                strHtml += '<span title="下一页">下一页</span>&nbsp;';
                strHtml += '<span title="上一页">上一页</span>&nbsp;';
            } else {
                strHtml += '<span title="下一页"><a href="javascript:' + this.name + '.toPage(' + nextPage + ');">下一页</a>&nbsp;</span>';
                strHtml += '<span title="最后一页"><a href="javascript:' + this.name + '.toPage(' + this.pageCount + ');">最后一页</a>&nbsp;</span>';
            }
            strHtml += '</span><br />';
    return strHtml;
}
showPages.prototype.createUrl = function (page) { //create url
    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){ //jump to 
    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(){ //show html code
    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();
    
}
showPages.prototype.formatInputPage = function(e){ //format
    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;
}