function display_block()
{
	src = 'http://www.paperbackswap.com/scripts/output_books.php?m=' + PBS_member + '&t=' + PBS_type;	
	document.write('<ifr' + 'ame ' + 'name="pbs_books" frameborder="0" height="400" width="500" src="' + src + '"></ifr' + 'ame>');	
}
display_block();