var imageList;
var imageDir="../boutons/";
var Nav2=false;
var Msie=false;
Nav2=navigator.userAgent.indexOf ("Mozilla/2") != -1;
Msie=navigator.userAgent.indexOf ("MSIE") != -1 ;

function preLoad() {
    imageList=new Array( "accueil1_n.gif", "accueil1_nb.gif",
                       "jerican_b.gif", "jerican_nb.gif" );
    onImage=new Array();
    if(document.images) {
        for (field in imageList) {
            onImage[field]=new Image();
            onImage[field].src=imageDir+imageList[field];
        }
    }
}

 function un(srcName) {
    if(document.images) {
    document[srcName].src=imageDir+srcName+"_nb.gif";
    }
}

function deux(srcName) {
    if(document.images) {
    document[srcName].src=imageDir+srcName+"_n.gif";
    }
}