if (document.images) 
{
toc1on = new Image(30,30);
toc1on.src = "../../images/next_over.gif";
toc1off= new Image(30,30);
toc1off.src= "../../images/next.gif";

toc2on = new Image(30,30);
toc2on.src = "../../images/prev_over.gif";
toc2off= new Image(30,30);
toc2off.src= "../../images/prev.gif";

}
function img_act(imgName)
{
if (document.images) 
{
imgOn = eval(imgName + "on.src");
document[imgName].src = imgOn;
}

}
function img_inact(imgName)
{
if (document.images) 
{
imgOff = eval(imgName + "off.src");
document[imgName].src = imgOff;
}

}