function popupwindow(url,windowname,properties) {
	var popupwindow = null;
		if (!properties) { properties = "width=688,height=527,toolbar=no,menubar=no,scrollbars=yes,resizable=yes,location=no,directories=no,status=no,screenx=0,screenY=0,top=0,left=0"; }	
		if (!windowname) { windowname = "RCPopup"; }

    popupwindow = window.open(url,'windowname',properties);
	if (popupwindow.opener == null) {popupwindow.opener = self; }
	popupwindow.focus();
}

function popback(url,target) {
		if (target != '') { 
			target.window.location.href = url; 
		} else {
			window.location.href = url;	
		}
		target.focus();
}