function window_open(fname,nWidth,nHeight) {
	var attr = "left=" + ((screen.width-nWidth)/2-5) + ",top=" + ((screen.height-nHeight)/2-29) + ","+
	"resizable=0,width=" + nWidth + ",height=" + nHeight + ",menubar=0, scrollbars=0";
	var theWindow=window.open(fname,"name", attr)
	theWindow.focus();
  	}