i_on = new Image(48,34);
i_on.src = "../images/index2.gif";
n_on = new Image(48,34);
n_on.src = "../images/next2.gif";
b_on = new Image(48,34);
b_on.src = "../images/back2.gif";
i_off = new Image(48,34);
i_off.src = "../images/index.gif";
n_off = new Image(48,34);
n_off.src = "../images/next.gif";
b_off = new Image(48,34);
b_off.src = "../images/back.gif";

function ichange(iname,isrc)
{
    inew=eval(isrc+".src");
    document[iname].src=inew;
    }