function showmain(id) {
	hidecontent('main_title0');hidecontent('main_image0');hidecontent('main_summary0');
	hidecontent('main_title1');hidecontent('main_image1');hidecontent('main_summary1');
	hidecontent('main_title2');hidecontent('main_image2');hidecontent('main_summary2');
	hidecontent('main_title3');hidecontent('main_image3');hidecontent('main_summary3');
	hidecontent('main_title4');hidecontent('main_image4');hidecontent('main_summary4');
	hidecontent('main_title5');hidecontent('main_image5');hidecontent('main_summary5');
	hidecontent('main_title6');hidecontent('main_image6');hidecontent('main_summary6');
	hidecontent('main_title7');hidecontent('main_image7');hidecontent('main_summary7');
	hidecontent('main_title8');hidecontent('main_image8');hidecontent('main_summary8');
	hidecontent('main_title9');hidecontent('main_image9');hidecontent('main_summary9');


	document.getElementById('main_title'+id).style.display = 'block';
	document.getElementById('main_image'+id).style.display = 'block';
	document.getElementById('main_summary'+id).style.display = 'block';
}

function hidecontent(id) {
	document.getElementById(''+id).style.display = 'none';
}