var myWindow = '';
	
function popup(url) {
	if (!myWindow.closed && myWindow.location) {
		myWindow.location.href = url;
	}else {
		myWindow = window.open(url,'myWindow','height=450,width=450,scrollbars=yes');
	}
	
	if (window.focus) {myWindow.focus()}
	return false;
}