function popup_window(url, window_name, height, width, props)
{
	leftPos = 0
	heightPos = 0
	if (screen) {
		leftPos = screen.width/2-(width/2)
		heightPos = screen.height/2-(height/2)
	}

	newWindowPop = window.open("/MusaWeb/" + url,window_name,props+',height='+height+',width='+width+',left='+leftPos+',top='+heightPos)
  newWindowPop.focus();
}