var currentOpacity = 0;
var maxOpacity = 80;
function changeOpac(opacity,id,get) {
    var object = document.getElementById(id).style;
    if(get==1)
    {
        object.opacity = (opacity / 100);
        object.MozOpacity = (opacity / 100);
        object.KhtmlOpacity = (opacity / 100);
        object.filter = "alpha(opacity=" + opacity + ")";
    }
    return object.opacity * 100;
}

function setOpacity(maxopac)
{
	if(maxopac)
		maxOpacity = maxopac;
    if(currentOpacity < maxOpacity)
    {
        var id = "accueil_texte";
        var speed = 6;
        var timer = 0;
        var i = 0;
        for(i = 0; i <= maxOpacity; i++) {
            timer++;
            setTimeout("changeOpac(" + i + ",'"+id+"',1)",(timer * speed));
            currentOpacity++;
        }
        currentOpacity = maxOpacity;
    }
}