var win=null

function winx(url)
	{
		
	if (!win || win.closed)
	  {	
win=window.open(url,"","toolbar=yes,location=yes,status=yes,menubar=yes,scrollbars=yes,resizable=yes,width=600,height=350,left=0,top=0");

	  } else 
	  {
	  //if window is already open, bring to front
	 win.focus();
	 win.location=url
	  }
	}