gazo1=new Image();
gazo1.src="gazo1.jpg";
gazo2=new Image();
gazo2.src="gazo2.jpg";
gazo3=new Image();
gazo3.src="gazo2.jpg";
function Change(num) {
Br = navigator.appName;
Ver = navigator.appVersion;
if((Br=="Microsoft Internet Explorer" && parseInt(Ver.substring(0,1))>3) || (Br=="Netscape" && parseInt(Ver.substring(0,1))>2))
{
with(document)
{
if(num==1) gazo.src=gazo1.src;
else if(num==2) gazo.src=gazo2.src;
else gazo.src=gazo3.src;
}
}
}