function toggle_collapse(objname) {
	var obj = $(objname);
	var oldstatus = obj.style.display;

	obj.style.display = oldstatus == 'none' ? '' : 'none';

	if(img = $(objname + '_img')) {
		var img_regexp = new RegExp((oldstatus == 'none' ? '_yes' : '_no') + '\\.gif$');
		var img_re = oldstatus == 'none' ? '_no.gif' : '_yes.gif';
		img.src = img.src.replace(img_regexp, img_re);
	}
}



function $(id) {
	return document.getElementById(id);
}