function OnClientValueChanging(sender, args)
{
    var txtBedrag = document.getElementById("txtBedrag");
    txtBedrag.value = "€ " + args.get_newValue().formatMoney(2, ',', '.');
}

function OnClientValueChanging2(sender, args)
{                                        
    var txtDuurPremiebetaling = document.getElementById("txtDuurPremiebetaling");
    txtDuurPremiebetaling.value = args.get_newValue();
}

function OnClientSlideEnd(sender, args)
{
    var txtBedrag = document.getElementById("txtBedrag");
    txtBedrag.value = "€ " + sender.get_value().formatMoney(2, ',', '.'); 
}

function OnClientSlideEnd2(sender, args)
{
    var txtDuurPremiebetaling = document.getElementById("txtDuurPremiebetaling");
    txtDuurPremiebetaling.value = sender.get_value(); 
}

// Verander een string (c) in een money string
Number.prototype.formatMoney = function(c, d, t)
{ 
    var n = this, c = isNaN(c = Math.abs(c)) ? 2 : c, t = t == undefined ? "." : t, s = n < 0 ? "-" : "", i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", j = (j = i.length) > 3 ? j % 3 : 0;
     
    return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(0).slice(2) : "").replace(",", ""); 
};