<div url-show="http://docs.google.com/viewer?url=http://amiro.ru/_mod_files/_upload/example.doc&amp;embedded=true" class="show_docs" onclick="showDocs(this); return false;">

<script>
    function showDocs(oLink) {
        var oBlock = oLink.getElementsByTagName('div')[0];
        var oIframe = oLink.getElementsByTagName('iframe')[0];
        var oIframeUrl = oLink.getAttribute('url-show');
        if(oBlock.style.height == 0+'px') {
            oBlock.style.height = 980+'px';
            if(oIframe.src != oIframeUrl) {oIframe.src = oIframeUrl};
        } else {
            oBlock.style.height = 0+'px';
        }
    }
</script>