list = $('mainbody_public').select("img");
for (i=0;i<list.length;i++) {
	tmpWidth = list[i].getWidth();
	tmpHeight = list[i].getHeight();

	if (tmpWidth > 450) {
		newWidth = 450;
		diff = tmpWidth - newWidth;

        	newHeight = tmpHeight - diff;

		list[i].writeAttribute('width', newWidth);
		list[i].writeAttribute('height', newHeight);
	}
}