function pop_up(url){
  atributo='scrollbars=no' + 'scrolling=yes'
           'location=no,menubar=no,status=no,titlebar=no,' +
           'toolbar=no';

  if (screen.availWidth<800) width=screen.availWidth;
  else width=800;

  if(screen.availHeight<600) height=screen.availHeight;
  else height=600;

  pos_width=(screen.availWidth-width)/2;
  pos_height=(screen.availHeight-height)/2;
  janela=window.open(url,'Sistemas', atributo);
  janela.resizeTo(width, height) ;
  janela.moveTo(pos_width, pos_height);
 }


 
 function tela_sisaud(){
  atributo='scrollbars=no' + 'scrolling=yes'
           'location=no,menubar=no,status=no,titlebar=no,' +
           'toolbar=no';

  if (screen.availWidth<800) width=screen.availWidth;
  else width=800;

  if(screen.availHeight<600) height=screen.availHeight;
  else height=600;

  pos_width=(screen.availWidth-width)/2;
  pos_height=(screen.availHeight-height)/2;
  janela=window.open('http://www.audin.mpu.gov.br/aplicativos/sis_aud/sis_aud.php','Sistemas', atributo);
  janela.resizeTo(width, height) ;
  janela.moveTo(pos_width, pos_height);   
 }