if (document.images) {
 var homeb = new Image();
 homeb.src = "common/homea.gif";
 var homea = new Image();
 homea.src = "common/homeb.gif";
  
 var aimsb = new Image();
 aimsb.src = "common/aimsa.gif";
 var aimsa = new Image();
 aimsa.src = "common/aimsb.gif";

 var backgroundb = new Image();
 backgroundb.src = "common/backgrounda.gif";
 var backgrounda = new Image();
 backgrounda.src = "common/backgroundb.gif";

 var forumb = new Image();
 forumb.src = "common/foruma.gif";
 var foruma = new Image();
 foruma.src = "common/forumb.gif";

 var florab = new Image();
 florab.src = "common/floraa.gif";
 var floraa = new Image();
 floraa.src = "common/florab.gif";


 var linksb = new Image();
 linksb.src = "common/linksa.gif";
 var linksa = new Image();
 linksa.src = "common/linksb.gif";
}
function act(imgName) {
  if (document.images) 
    document[imgName].src = eval(imgName + "a.src");
}

function inact(imgName) {
  if (document.images)
    document[imgName].src = eval(imgName + "b.src");
}