function change_image( base, valeur, max) {

    var id = null

    var element_style

    for (j = 1; j <= max; j++) 
    {
        element_style = null
        id = base + j
        if ( document.getElementById ) {
            element_style=document.getElementById( id ).style;
        } 
        else {
            if ( document.all ) {
                element_style=document.all[id].style;
            } 
            else {
                if ( document.layers ) {
                    element_style=document.layers[ id ];
                }
            }
        }

        if ( element_style ) {
            if ( j == valeur ) {
                if( element_style.visibility == 'hidden' )
                { 
                    eval( 'element_style.visibility="visible"' );
                    eval( 'element_style.display="block"' );
                }
                else
                {
                    eval( 'element_style.visibility="hidden"' );
                    eval( 'element_style.display="none"' );
                }
            } 
            else {
                eval( 'element_style.visibility="hidden"' );
                eval( 'element_style.display="none"' );
            }
        } 
    }
}