function newImage(arg) {	
  if (document.images) 
  {
		rslt = new Image();		rslt.src = arg;		return rslt;	
  }
}
  
function changeImages() 
{	
  if (document.images && (preloadFlag == true)) {		
    for (var i=0; i<changeImages.arguments.length; i+=2) 
    {			
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }	
  }
}

var preloadFlag = false;

function preloadImages() {	
  if (document.images) {		
    qui_sommes_nous_over = newImage("images/qui_sommes_nous-over.gif");		
    votre_capital_souffle_over = newImage("images/votre_capital_souffle-over.gif");	
   	mesure_du_souffle_over = newImage("images/mesure_du_souffle-over.gif");
 		asthme_over = newImage("images/asthme-over.gif");
 		bpco_over = newImage("images/bpco-over.gif");	
   	asthme_et_bpco_en_question_over = newImage("images/asthme_et_bpco_en_question-.gif");	
   	paroles_de_medecins_over = newImage("images/paroles_de_medecins-over.gif");	
   	professionnels_de_sante_over = newImage("images/professionnels_de_sante-ove.gif");	
   	documentation_over = newImage("images/documentation-over.gif");	
   	preloadFlag = true;	
  }
}