pop up windiw

<script type="text/javascript">

document.body.onclick= function(){

window.open('your web address', 'poppage', 'toolbars=0, scrollbars=1, location=0, 
statusbars=0, menubars=0, resizable=1, width=650, height=650, left = 300, top = 50');
}</script>

http://www.allbloggertips.com/2012/06/how-to-add-popup-window-in-blogger.html