function collapse()
{
divs=document.getElementsByTagName("div")
	for (i=6;i<17;i++)
	{ divs[i].style.visibility="hidden";
	}
}

function expand(item)
{
collapse();
obj=document.getElementById(item);
obj.style.visibility="visible";
}

function roll_over(img_name, img_src)
{
document[img_name].src = img_src;
}

function hidediv()
{
divs=document.getElementsByTagName("div")
	for (i=17;i<25;i++)
	{ divs[i].style.visibility="hidden";
	}
}

function changeto(item)
{
hidediv();
obj=document.getElementById(item);
obj.style.visibility="visible";
}