<a _blank="" href="http://your-link-view" imageanchor="1" onclick="window.open(this.href, 'popupwindow', 'width=420, height=350, resizable=no, scrollbars=yes, menubar=no, toolbar=no, status=no'); return false; " style="clear: left; display: block; margin: 0 auto; text-align: center;"><img alt="Blogger Logo Grey" src="http://your-link-image" title="" width="200" border="0" height="60"></a>

http://wiki-blogger.blogspot.com/2011/02/javascript-popup.html

Javascript Popup

javascript

JavaScript