var WinOpen;

function show_services() {
 	height = 200 + 30;
 	width = 480 + 30;

	p_top=(screen.height-200)/2-30;
	p_left=(screen.width-480)/2-30;

    if(WinOpen != null){
     	  WinOpen.close();
          WinOpen  =  window.open("how_to_activate.html", "Foto", "closed=yes, toolbar=no, location=no, top="+p_top+", left="+p_left+", directories=no, status=no, menubar=no, scrollbars=no, resizable=no, width="+width+", height="+height+"");
    }else{
          WinOpen  =  window.open("how_to_activate.html", "Foto", "closed=yes, toolbar=no, location=no, top="+p_top+", left="+p_left+", directories=no, status=no, menubar=no, scrollbars=no, resizable=no, width="+width+", height="+height+"");
}
    if(WinOpen != null){
          WinOpen  =  window.open("how_to_activate.html", "Foto", "closed=yes, toolbar=no, location=no, top="+p_top+", left="+p_left+", directories=no, status=no, menubar=no, scrollbars=no, resizable=no, width="+width+", height="+height+"");
    }

return WinOpen;

}