function popUp(iWidth, iHeight, sUrl) {
	w = screen.availWidth;
	h = screen.availHeight;
	left = (w-iWidth)/2;
	top = (h-iHeight)/2;
	window.open(sUrl, '_blank','width='+iWidth+',height='+iHeight+',top='+top+',left='+left);
}

// aanmelden nieuwsbrief via ajax
function nieuwsbriefAanmelden() {

 	name 		= $("input#if_name").val();
 	email		= $("input#if_email").val();
 	errorMessage	= "";

 	if ( name == "" ) {
 		errorMessage = "U dient uw naam in te vullen.";
 	} else if ( email == "" ) {
 		errorMessage = "U dient uw e-mail in te vullen";
 	}

 	var log        = $("#ajax-result").addClass("ajax-loading-hide");
 	var ajaxLoader = $("#ajax-loader").empty().addClass('ajax-loading');

 	function formValidateError(error) {
 		log.removeClass('ajax-loading-hide');
 		ajaxLoader.removeClass('ajax-loading');
 		document.getElementById('errorMsg').innerHTML = error;
 		return false;
 	}

 	if ( errorMessage != "" ) {
 		log.removeClass("ajax-loading-hide");
 		ajaxLoader.removeClass("ajax-loading");
 		alert(errorMessage);
 	} else {
 		$.ajax({
 			async:	false,
 			type: 	"POST",
 			url: 	"ajax/mailing/register.php",
 			data: 	"email=" + email + "&name=" + name,
 			success: function(html){
 				log.html(html);
 			},
 			complete: function () {
 				log.removeClass("ajax-loading-hide");
 				ajaxLoader.removeClass("ajax-loading");
 			}
 		});
 	}

}