function back()
{
	for(i=0;i<i_name.length;i++)
	{
	 	document.images[i_name[i]].src = off[(i+1)].src;
	}
	act_img='';
	act_nr=0;
}
	 	
if (document.images){
        var act_img ="";
        var act_nr =0;
        off = new MakeArray(2);
        over = new MakeArray(2);

        i_name=  new Array('bal','art');

        off[1].src = "images/bal_richt_on.jpg";
        off[2].src = "images/art_richt_on.jpg";

        over[1].src = "images/bal_richt.jpg";
        over[2].src = "images/art_richt.jpg";
}


function MakeArray(n){

        this.length = n
        for (var i = 1; i<=n; i++)
        {
                this[i] = new Image()
        }
                return this;
}


function wechsel(name, nr)
{
        if (document.images && (act_img != name && act_nr != nr))
        {
                document.images[name].src = over[nr].src;
        }

}

function wech(name, nr){
        if (document.images && (act_img != name && act_nr != nr))
        {
                document.images[name].src = off[nr].src;
        }

}



function active_img(name, nr)
{
	
	if(act_img)
	{
	     
	    document.images[act_img].src = off[act_nr].src;
	     
	}
	
	act_img = name;
	act_nr= nr;
}