bVer =parseInt(navigator.appVersion);
bName=navigator.appName;
if (bVer >=3 && bName=="Netscape") gSupport=1;
else if (bVer >=4) gSupport=1;
else gSupport=0;
if (gSupport==1)
{

  	img1 = new Image();
        img1.src = "img/ct/past_micro.gif";
        img1a = new Image();
        img1a.src = "img/ct/past_micro_act.gif";
	img2 = new Image();
        img2.src = "img/ct/past_distribucion.gif";
        img2a = new Image();
        img2a.src = "img/ct/past_distribucion_act.gif";
	img3 = new Image();
        img3.src = "img/ct/past_fabricacion.gif";
        img3a = new Image();
        img3a.src = "img/ct/past_fabricacion_act.gif";
	img4 = new Image();
        img4.src = "img/ct/past_contactar.gif";
        img4a = new Image();
        img4a.src = "img/ct/past_contactar_act.gif";
}

function rollover(iName)
                {
                if (gSupport==1)
                         {
                                 thename = eval(iName + "a.src");
                                 document[iName].src = thename;
                }
        }
function rolloff(iName)
                {
        if (gSupport==1)
                {
                thename = eval(iName + ".src");
                document[iName].src = thename;
                }
        }