function Realisatie() {
	var w = 800, h = 600;
	if (document.all || document.layers) {
		w = screen.availWidth;
		h = screen.availHeight;
	}
	var popW = 379, popH = 242;
	var leftPos = (w-popW)/2, topPos = (h-popH)/2;
	newwindow = window.open("http://www.amercom.nl/realisatie/realisatie.html","realisatie","width="+popW+",height="+popH+",top="+topPos+",left="+leftPos+",scrollbars=no");
	if (window.focus)
	{
		newwindow.focus();
	}
}

function TextBoxRefillerCheck(field, prefilledvalue) {
    if (field.value == prefilledvalue) {
        field.value = '';
    }
}

function TextBoxRefiller(field, textvalue) {
    if (field.value.length == 0) {
        field.value = textvalue;
    }
}