var ver = 0;
function doInit() {
    var ua = window.navigator.userAgent;
    var msie = ua.indexOf ( "MSIE " )
    if ( msie > 0 )
        ver = parseInt ( ua.substring ( msie+5, ua.indexOf ( ".", msie ) ) );
}

function eIn(knop) {
      if (document.all && document.all[knop]!=null) 
            document.all[knop].style.visibility='visible';
}

function eOut(knop) {
      if (document.all && document.all[knop]!=null) 
           document.all[knop].style.visibility='hidden';
}

function clikker(a) {
	if (a.style.display == '') {
		a.style.display = 'none';
	} else {
		a.style.display='';
	}
}