// YE OLDE POPPER UPPER
//
// Handler looks like this:
// onclick="popup(this,'left=10, top=30, scrollbars=0, statusbar=0, menubar=0, width=780, height=425'); return false;"

var _POPUP_FEATURES = 'location=0, statusbar=0, menubar=0, width=400, height=300';

function isUndefined(v) {
	var undef;
	return v===undef;
}

function raw_popup(url, target, features) {
	if (isUndefined(features)) {
		features = _POPUP_FEATURES;
	}
	if (isUndefined(target)) {
		target = '_blank';
	}
	var theWindow = window.open(url, target, features);
	theWindow.focus();
	return theWindow;
}

function popup(src, features) {
	return raw_popup(src.parentNode.getAttribute('href'), src.getAttribute('target') || '_blank', features);
}