function mnt_slider(mnt_id, mnt_num_element){
	for(i=0;i<=mnt_num_element;i++){
		document.getElementById('mnt_pic_'+i).style.display='none';
	}
	document.getElementById('mnt_pic_'+mnt_id).style.display='block';
	document.getElementById('mnt_pic_'+mnt_id).focus();
}