opa=0;
opacnt=10;

function FadeInstr() {
gazouId = "gazou1";
MyIMG = document.getElementById(gazouId);
MyIMG.style.visibility = "visible";
FadeIn1(gazouId,opa);
}

function FadeIn1(gazouId,opa) {
if (opa <= 100) {
document.getElementById(gazouId).style.filter = "alpha(opacity:"+opa+")";
document.getElementById(gazouId).style.opacity = opa/100;
opa += opacnt;
setTimeout("FadeIn1('"+gazouId+"',"+opa+")", 100);
}
}