var imgOn = new Array();
var imgOff = new Array();

function newImgOn(id, src)
{
	imgOn[id] = new Image();
	imgOn[id].src = "images/" + src + ".gif";
}

function newImgOff(id, src)
{
	imgOff[id] = new Image();
	imgOff[id].src = "images/" + src + ".gif";
}

function newImg(id, src_on, src_off)
{
	newImgOn(id, src_on);
	newImgOff(id, src_off);
}

function switchOn(section_id)
{
	document.images["link_"+section_id].src = imgOn[section_id].src;
}

function switchOff(section_id)
{
	document.images["link_"+section_id].src = imgOff[section_id].src;
}