// rollover functions

new_nbItem ('corp', 'n/', 100, 39);
new_nbItem ('prod', 'n/', 78, 39);
new_nbItem ('serv', 'n/', 82, 39);
new_nbItem ('help', 'n/', 91, 39);
new_nbItem ('dnet', 'n/', 135, 39);
new_nbItem ('ctus', 'n/', 103, 39);

function nbItem (img_name, loc, width, height) {
	img_str = "i/" + loc + img_name;

	this.img_name_off = new Image (width, height);
	this.img_name_off.src = img_str + "_off.gif";
	this.img_name_on = new Image (width, height);
	this.img_name_on.src = img_str + "_on.gif";
}

function new_nbItem (img_name, loc, width, height) {
	nbItem [img_name] = new nbItem (img_name, loc, width, height);
}

function nbOver (img_name) {
	document.images[img_name].src = nbItem[img_name].img_name_on.src;
}

function nbOut (img_name) {
	document.images[img_name].src = nbItem [img_name].img_name_off.src;
}