function video ()
{
    if ( document.getElementById ( 'videos' ) )
    {
        var videos = document.getElementById ( 'videos' ).getElementsByTagName ( 'a' );
        
        for ( var i = 0; i < videos.length; i++ )
        {
            videos [ i ].onclick = function ()
            {
                var width = 776;
                var height = 442;
                var left = ( ( screen.availWidth - width - 10 ) * 0.5 );
                var top = ( ( screen.availHeight - height - 30 ) * 0.5 );
                
                window.open ( this.href, 'Instructievideo', 'width=' + width + ', height=' + height + ', left=' + left  + ', top=' + top );
                
                return false;
            };
        };
    };
};

load ( 'video ()' );