function modify_table_visible(id, key) {
if(document.getElementById(id).checked)
{
table_1.columns( '.' + key ).visible( true );
localStorage.setItem(window.location.href + '-haschecked-' + id, true);
}
else
{
table_1.columns( '.' + key ).visible( false );
localStorage.setItem(window.location.href + '-haschecked-' + id, false);
}
}
