jQuery(document).ready(function(){		
    if(jQuery("#jsAdvertismentBlock").size() > 0 && jQuery("#content").size() > 0 && jQuery("#sidebar").size() > 0){		
		var pageHeight = jQuery("#content").height();
		var sideBarHeight = jQuery("#sidebar").height();				
		if(pageHeight-sideBarHeight >= 600){			
			jQuery("#jsAdvertismentBlock").html('<div style="margin-top:5px; display:block; text-align:center;"><iframe src="http://www.namai.lt/banner.php?pos=31" width="160" height="600" frameborder="0" scrolling="no" allowtransparency="true" hspace="0" vspace="0" marginheight="0" marginwidth="0"></iframe></div>');		
		}								
	}		
 });