function backToTop()
{
    var x1 = x2 = x3 = 0;
    var y1 = y2 = y3 = 0;

    if (document.documentElement)
	{
        x1 = document.documentElement.scrollLeft || 0;
        y1 = document.documentElement.scrollTop || 0;
    }

    if (document.body)
	{
        x2 = document.body.scrollLeft || 0;
        y2 = document.body.scrollTop || 0;
    }

    x3 = window.scrollX || 0;
    y3 = window.scrollY || 0;

    var x = Math.max(x1, Math.max(x2, x3));
    var y = Math.max(y1, Math.max(y2, y3));

    window.scrollTo(Math.floor(x / 2), Math.floor(y / 2));

    if (x > 0 || y > 0)
	{
        window.setTimeout("backToTop()", 25);
    }
}

function bookmarksite(title,url)
{
	if (window.sidebar) // firefox
		window.sidebar.addPanel(title, url, "");
	else if(window.opera && window.print)
	{ // opera
		var elem = document.createElement('a');
		elem.setAttribute('href',url);
		elem.setAttribute('title',title);
		elem.setAttribute('rel','sidebar');
		elem.click();
	}
	else if(document.all)// ie
		window.external.AddFavorite(url, title);
}

function aboswitch(id)
{
	var abovorm = document.getElementById("neemofgeef"),
		adres2 = document.getElementById("factuuradres"),
		omschr = document.getElementById("omschr1");

	if ( id == 1 )
	{
		abovorm.value = "geef";
		adres2.style.display = "block";
		omschr.innerHTML = "Bezorggegevens";
	}
	else
	{
		abovorm.value = "neem";
		adres2.style.display = "none";
		omschr.innerHTML = "Bezorg- en factuurgegevens";
	}
}