function MM_openBrWindow(theURL,wx,wy,winname){
 x = (screen.width-wx) / 2;
 y = (screen.height-wy) / 2;
 strposi ="left="+x+",top="+y+",width="+wx+",height="+wy;
 window.open(theURL,winname,'scrollbars=yes,resizable=no,'+strposi);
}