// Window Open

function m_win(url,windowname,width,height) {
  var features="location=no, menubar=no, status=yes, scrollbars=yes, resizable=yes, toolbar=no";
  if (width) {
	if (window.screen.width > width)
	  features+=", left="+(window.screen.width-width)/2;
	else width=window.screen.width;
	  features+=", width="+width;
  }
  if (height) {
	if (window.screen.height > height)
	  features+=", top="+(window.screen.height-height)/2;
	else height=window.screen.height;
	  features+=", height="+height;
  }
  window.open(url,windowname,features);
}