function window_open(page, w, h){ 
   options = "height="+h+",width="+w+",resizable=no,scrollbars=0," 
  	+ "screenX="+(screen.availWidth-10-w)/2+",screenY="+(screen.availHeight-20-h)/2+","
	+ "left="+(screen.availWidth-10-w)/2+", top="+(screen.availHeight-20-h)/2+","
	+ "location=0,status=0,menubar=0" 
  window.open(page, "", options); 
}
function window_open_scroll(page, w, h){ 
   options = "height="+h+",width="+w+",resizable=no,scrollbars=0," 
  	+ "screenX="+(screen.availWidth-10-w)/2+",screenY=20,"
	+ "left="+(screen.availWidth-10-w)/2+", top=20,"
	+ "location=0,status=0,menubar=0" 
  window.open(page, "", options); 
}
function window_open_fullscreen(page){ 
   options = "height="+screen.availHeight-20+",width="+screen.availWidth-10+",resizable=no,scrollbars=0," 
  	+ "screenX=0,screenY=20,"
	+ "left=0, top=0,"
	+ "location=0,status=0,menubar=0" 
  window.open(page, "", options); 
}