function bookAuthor(kword) {
	var	modulus = 9;
	var	algo = 0;

	if(kword.match(/\d{13}/) && (kword.charAt(3) ==0)) { 
		isbn = kword.substring(4,12);
		for (var i=0;i<isbn.length;i++) {
			algo += (parseInt(isbn.charAt(i)) * modulus);
			--modulus;
		}
		modulo = algo % 11;
		if(modulo == 1) {
			checksum = 'X';
		} else if(modulo == 0) {
			checksum = '0';
		} else {
			checksum = 11 - modulo;
		}
		kword10 = '0' + isbn + checksum;
	}
	
	if(kword.match(/\D/)) { 
		return false; 
	} else if(kword.length<10) {
		document.write('<div class="author_info">');
		document.write('<img src="http://www.randomhouse.com/images/dyn/auth/?source=' + kword + '&width=170" alt="" />');
		document.write('<\/div>');
	} else {
		document.write('<div class="book_info">');
		document.write('<img src="http://www.randomhouse.com/images/dyn/cover/?source=' + kword + '&height=300&maxwidth=170" alt="" border="0" />');
		document.write('<p><strong>Buy the Book<\/strong><br />');
		if(kword10) {
			document.write('<a href="http://www.amazon.com/gp/product/' + kword10 + '?ie=UTF8&tag=randohouseinc-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=' + kword10 + '">Amazon<\/a> | ');
		} else {
		    document.write('<a href="http://www.amazon.com/s/field-keywords=' + kword + '&search-alias=stripbooks">Amazon<\/a> | ');
		}
		document.write('<a href="http://search.barnesandnoble.com/booksearch/isbnInquiry.asp?z=y&EAN=' + kword + '">B&amp;N<\/a><br>');
		document.write('<a href="http://www.borders.com/online/store/SearchResults?book_search=&sku=' + kword + '">Borders<\/a> | ');
		document.write('<a href="http://www.indiebound.org/book/' + kword + '">Indie Bound<\/a> <br>');
		document.write('<a href="http://www.randomhouse.com/catalog/display.pperl?isbn=' + kword + '">Random House<\/a><\/p><p><a href="http://www.randomhouse.com/catalog/display.pperl?isbn=' + kword + '">About the Book<\/a><br /><a href="http://www.randomhouse.com/catalog/display.pperl?isbn=' + kword + '&view=excerpt">Read an excerpt<\/a><\/p>');
		document.write('<\/div>');
	}
}