var selectedURL = window.location.href.substring(window.location.href.lastIndexOf("/")+1,window.location.href.length); 

var page = selectedURL.replace('.html','');
var fb = '#';

var cSide = '';

cSide += "<div id='aside'><div class='pic-widget'>";
cSide += "	<div class='pic1' style='background:url(images/"+ page +"1.png) no-repeat;'></div>";
cSide += "		<div class='pic2' style='background:url(images/"+ page +"2.png) no-repeat;'>";
cSide += "				<a href='"+ fb +"'>More on Facebook</a>";
cSide += "		</div></div></div>";

document.write(cSide);