function write_image_guides ( showguide ) {

	/**
	 * these are the pixel widths of the image guides used
	 */

	var guides = [126, 128, 130, 131, 133, 135, 136, 138, 139, 90];
	var write  = "";

	for ( var i = 0; i < guides.length; i++ ) {
		write += "<div class=\"iwrap" + (i == 0 ? " first" : "") + "\" style=\"width:" + guides[i] + "px;\"></div>";
	}

	document.write(write);

}