<!-- wizard8.jsp -->




function convert_isbn(input) {
        var output = "";
       	if(input.length == 13) {
       		input = input.substr(3, 9);

       		var total = 0;
       		for(var i=0; i<9; i++) {
       			total += new Number(input.charAt(i)) * (i+1);
       		}
       		var check = total % 11;
       			if(check == 11) {
       			input += "0";
       		} else if(check == 10) {
			input += "X";
       		} else {
       			input += check;
       		}

       		output = input;
       	} else if(input.length == 10) {
        	input = "978" + input.substr(0, 9);

       		var total = 0;
       		var multiplier = 1;
       		for(var i=0; i<12; i++) {
       			total += new Number(input.charAt(i)) * multiplier;
       			if(multiplier == 1) {
       				multiplier = 3;
       			} else {
       				multiplier = 1;
       			}
       		}
       		var check = 10 - (total % 10);

       		if(check == 10) {
       			input += "0";
       		} else {
       			input += check;
       		}

       		output = input;
       	} else {
       		output = "Invalid ISBN";
     	}
        return output;
}

jQuery(window).load(function() {
	jQuery(".centreMe").each(function() {
		var top = (jQuery(this).parent().height() - jQuery(this).height())/2;
                jQuery(this).css({position: 'relative', top: top, visibility: 'visible'});
	});

        jQuery("#isbn_converter_button").click(function() {
        	var input = jQuery("#isbn_converter_input").val();
        	input = input.replace(/[^0-9xX]/g, "");
                jQuery("#isbn_converter_input").val(input);

                var output = convert_isbn(input);

                jQuery("#isbn_converter_output").html(output);
        });
});