function add_image ( ) {
	target = document.getElementById ('images');
	
	if ( parent.cnt_img < parent.max_img ) {
		// add a new row
		var startrow = target.rows.length;
		target.insertRow( startrow );
		var row = target.rows[ startrow ];
		var cell1 = row.insertCell('0');
		var cell2 = row.insertCell('1');
		cell1.className = 'left';
		cell2.className = 'right';
		cell1.innerHTML = parent.upload_word.replace ( /img_num/g, ( parent.cnt_img + 1 ) );
		cell2.innerHTML = parent.upload_field.replace ( /img_num/g, ( parent.cnt_img + 1 ) );
		
		// update count		
		parent.cnt_img++;

		// show / hide link
		if ( parent.cnt_img < parent.max_img ) {
			document.getElementById('add_img').style.display = '';
		} else {
			document.getElementById('add_img').style.display = 'none';
		}			
	} else {
		// hide link
		document.getElementById('add_img').style.display = 'none';
	}
}

function event_redirect ( date ) {
	if ( date ) {
		location.href = '/' + event_link + '/' + date;
	}
}