function logError( errorMsg, url, lineNumber ) {

	// TODO: onerror isn't part of any spec, so different browsers implement
	// it differently. is there an abstraction layer in Prototype we can use?

	new Ajax.Request(
		"/ajax/log_js_error.php5",
		{
			method: "post",
			postBody:
				"errorMsg=" + errorMsg +
				"&url=" + url +
				"&lineNumber=" + lineNumber
		}	
	);
	
	return false;
	
}

/**
 * Open a popup window containing the specified help file
 * @param    string   filename
 * @return   void
 */
function openHelp( filename ) {
	window.open( filename, 'help_popup', 'width=250, height=150, location=no, menubar=no, resizable=yes, scrollbars=yes, status=no, toolbar=no' );	
}

Event.observe( window, "error", logError );