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<style type="text/css" rel="stylesheet">
.ke-icon-image_news {
background-image: url('../skins/default.gif');
background-position: 0px -496px;
width: 16px;
height: 16px
}
</style>
<script type="text/javascript" charset="utf-8" src="../editor/kindeditor.js"></script>
<script type="text/javascript">
KE.lang['image_news'] = "添加新闻资讯图片";
KE.plugin['image_news'] = {
    click : function(id) {
        KE.util.selection(id);
        var dialog = new KE.dialog({
            id : id,
            cmd : 'image_news',
            width : 310,
            height : 90,
            title : KE.lang['image_news'],
            yesButton : KE.lang['yes'],
            noButton : KE.lang['no']
        });
        dialog.show();
    },
    check : function(id) {
        var dialogDoc = KE.util.getIframeDoc(KE.g[id].dialog);
        var type = KE.$('type', dialogDoc).value;
        var url = '';
        if (type == 1) {
            url = KE.$('imgFile', dialogDoc).value;
        } else {
            url = KE.$('url', dialogDoc).value;
        }
        var width = KE.$('imgWidth', dialogDoc).value;
        var height = KE.$('imgHeight', dialogDoc).value;
        var border = KE.$('imgBorder', dialogDoc).value;
        if (url.match(/\.(jpg|jpeg|gif|bmp|png)$/i) == null) {
            alert(KE.lang['invalidImg']);
            window.focus();
            KE.g[id].yesButton.focus();
            return false;
        }
        if (width.match(/^\d+$/) == null) {
            alert(KE.lang['invalidWidth']);
            window.focus();
            KE.g[id].yesButton.focus();
            return false;
        }
        if (height.match(/^\d+$/) == null) {
            alert(KE.lang['invalidHeight']);
            window.focus();
            KE.g[id].yesButton.focus();
            return false;
        }
        if (border.match(/^\d+$/) == null) {
            alert(KE.lang['invalidBorder']);
            window.focus();
            KE.g[id].yesButton.focus();
            return false;
        }
        return true;
    },
    exec : function(id) {
        KE.util.select(id);
        var dialogDoc = KE.util.getIframeDoc(KE.g[id].dialog);
        var type = KE.$('type', dialogDoc).value;
        if (!this.check(id)) return false;
        if (type == 1) {
            KE.$('editorId', dialogDoc).value = id;
            dialogDoc.uploadForm.submit();
            return false;
        } else {
            var url = KE.$('url', dialogDoc).value;
            var title = KE.$('imgTitle', dialogDoc).value;
            var width = KE.$('imgWidth', dialogDoc).value;
            var height = KE.$('imgHeight', dialogDoc).value;
            var border = KE.$('imgBorder', dialogDoc).value;
            this.insert(id, url, title, width, height, border);
        }
    },
    insert : function(id, url, title, width, height, border) {
        var html = '<img src="' + url + '" ';
        if (width > 0) html += 'width="' + width + '" ';
        if (height > 0) html += 'height="' + height + '" ';
        if (title) html += 'title="' + title + '" ';
        html += 'alt="' + title + '" ';
        html += 'border="' + border + '" />';
        KE.util.insertHtml(id, html);
        KE.layout.hide(id);
        KE.util.focus(id);
    }
};
    KE.show({
        id : 'content1',
        resizeMode : 0,
        minHeight : 300,
        siteDomains : ['d-go.net', 'www.d-go.net'],
        cssPath : '../editor/index.css',
        items : [
        'source', 'preview', 'fullscreen', 'undo', 'redo', 'print', 'cut', 'copy', 'paste',
        'plainpaste', 'wordpaste', 'justifyleft', 'justifycenter', 'justifyright',
        'justifyfull', 'insertorderedlist', 'insertunorderedlist', 'indent', 'outdent', 'subscript',
        'superscript', 'date', 'time', '-',
        'title', 'fontname', 'fontsize', 'textcolor', 'bgcolor', 'bold',
        'italic', 'underline', 'strikethrough', 'removeformat', 'selectall', 'image',
        'flash', 'media', 'layer', 'table', 'specialchar', 'hr',
        'emoticons', 'link', 'unlink', 'about','image_news'
        ]
    });
</script>

background-image: url('../skins/default.gif');

呵呵，困扰如此长时间的一个问题！居然是如此低级的错误！
惭愧！惭愧之至！
多谢您的提醒！