function _openWin(url, width, height) {
	ypos = screen.width / 2 - width / 2;
	xpos = screen.height / 2 - height / 2;

	var f1 = window.open(url, 'WMSWin', 'width='+width+',height='+height+',top='+xpos+',left='+ypos+',dependent=yes,scrollbars=no,status=yes');
	f1.focus();
}