关于基于Jquery的thickbox插件使用有关问题

关于基于Jquery的thickbox插件使用问题
问题描述：官方文档里讲任何形式的使用thickbox都需要有class="thickbox",源码里也有

JScript code

//add thickbox to href & [color=#FF0000]area elements that have a class of .thickbox[/color]function tb_init(domChunk){    $(domChunk).click(function(){    var t = this.title || this.name || null;    var a = this.href || this.alt;    var g = this.rel || false;    tb_show(t,a,g);    this.blur();    return false;    });}

HTML code

[<a href="javascript:void(0)" class="preview">预览</a>]

JScript code

var aLink = document.getElementsByTagName('a');    var nLinkCount = aLink.length;    for (var i = 0; i < nLinkCount; ++i) {        if (aLink[i].className == 'preview') {            aLink[i].onclick = function() {                ajax_request('share_action.php?action=preview', function() {                    try {                        eval('var oRet = ' + arguments[0].responseText + ';');//返回的参数                        share_create_iframe('preview_qq_share', g_sMengluInterfaceUrl + '?action=preview&time=' + oRet.time + '&token=' + oRet.token);                    }catch(e) {                        alert('预览失败');                    }                }                );                                                return false;            }        }    }

JScript code

function ajax_request(sServerUrl, fnCallback, bSync, oPostParam, vCallbackParam) {    var oHttpRequest = new window.XMLHttpRequest();    if (!bSync) {  //确定是同步还是异步         _set_onreadystatechange(oHttpRequest, fnCallback, vCallbackParam);    }    if (oPostParam) { //处理post方法所传递的参数 形式以&&&累加        var a = [];        for (var s in oPostParam) {            a.push(s + '=' + oPostParam[s]);        }        var sPostParam = a.join('&');    } else {        var sPostParam = null;    }    oHttpRequest.open(sPostParam ? 'post' : 'get', sServerUrl, !bSync);//post 非异步    oHttpRequest.setRequestHeader('If-Modified-Since', 'Thu, 01 Jan 1970 00:00:00 GMT');    if (sPostParam) {        oHttpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');        oHttpRequest.setRequestHeader('Content-Length', sPostParam.length);    }    oHttpRequest.send(sPostParam);    if (bSync && typeof fnCallback == 'function') {        fnCallback(oHttpRequest, vCallbackParam); //执行post方法返回的数    }}