var pop_win;
function openWin(url,win_height,win_width) {
	if (!win_height) win_height = 480;
	if (!win_width) win_width = 640;
	if ( pop_win && !pop_win.closed ) {
		pop_win.location = url;
		pop_win.resizeTo(win_width,win_height);
		pop_win.focus();
	} else {
		pop_win = window.open('','pop_win','directories=no,location=no,status=no,width=' + win_width + ',height=' + win_height + ',scrollbars=yes,menubar=no,titlebar=no,toolbar=yes,resizable=yes');
		pop_win.resizeTo(win_width,win_height);
		pop_win.focus();
		if ( !pop_win.closed ) pop_win.location = url;
		pop_win.opener = self;		
	}
}