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/**
 * 动态增加 CSS 样式表文件. 不会重复加载
 * 但在别处使用这个函数，这个js要先加载
 *
 * @param: string cssUri 载入的 CSS 样式表定义脚本路径.
 *
 * @author: Cai.Aimin
 * @email: cam_work@163.com
 * @since: 2008-03-05
 *
 * @return void
 */
function loadCss(cssUri) {
    if(!cssUri) return;
    var styles = document.getElementsByTagName("link");
    var len = styles.length;
    var isLoaded = false;
    for(var i=0; i < len; i++) {
        if(cssUri == styles[i].getAttribute("href")) {
            isLoaded = true;
            break;
        }
    }
    if(!isLoaded) {
        var headObj = document.getElementsByTagName("head")[0];
        var cssLink = document.createElement("link");
        cssLink.setAttribute("rel", "stylesheet");
        cssLink.setAttribute("type", "text/css");
        cssLink.setAttribute("media", "screen");
        cssLink.setAttribute("href", cssUri);
        headObj.appendChild(cssLink);
    }
}

/**
 * 动态增加 JavaScript 脚本文件.
 * 但在别处使用这个函数，这个js要先加载
 *
 * @param: string jsUri 载入的 JavaScript 脚本路径.
 *
 * @author: Cai.Aimin
 * @email: cam_work@163.com
 * @since: 2008-03-05
 *
 * @return void
 */
function loadJs(jsUri) {
    if(!jsUri) return;
    var js = document.getElementsByTagName("script");
    var len = js.length;
    for(var i=0; i < len; i++) {
        if(jsUri == js[i].getAttribute("src")) {
            js[i].parentNode.removeChild(js[i]);
            break;
        }
        var headObj = document.getElementsByTagName("head")[0];
        var jsLink = document.createElement("script");
        jsLink.setAttribute("type", "text/javascript");
        jsLink.setAttribute("src", jsUri);
       headObj.appendChild(jsLink);
    }
}