function open_window ( url, width, height ) 

{

  var twidth = width;

  var theight = height;

  var scrollbars = 0;



  if(twidth > screen.width - 80)

  {

    twidth = screen.width - 80;

    scrollbars = 1;

  }

  if(theight > screen.height - 80)

  {

    theight = screen.height - 80;

    scrollbars = 1;

  }



  var pos_x = (screen.width - twidth - 10)/2;

  var pos_y = (screen.height - theight - 29)/2;

   

  if(typeof(source_window) == "undefined" || source_window.closed)  

    source_window = window.open( url,'source_window','menubar=0,toolbar=0,location=0,scrollbars=' + scrollbars + ',screenX='+pos_x+',screenY='+pos_y+',left='+pos_x+',top='+pos_y+',width='+twidth+',height='+theight+',resizable=0');  

  else source_window.location.href = url;

  

	source_window.focus();

}



function op ( url, height )

{

  open_window ( url, 280, height );

}