function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		nav1 = newImage("images/nav_1-on.gif");
		nav2 = newImage("images/nav_2-on.gif");
		nav3 = newImage("images/nav_3-on.gif");
		nav4 = newImage("images/nav_4-on.gif");
		sub1a = newImage("images/sub_1a-on.gif");
		sub1b = newImage("images/sub_1b-on.gif");
		sub1c = newImage("images/sub_1c-on.gif");
		sub1d = newImage("images/sub_1d-on.gif");
		sub2a = newImage("images/sub_2a-on.gif");
		sub2b = newImage("images/sub_2b-on.gif");
		sub2c = newImage("images/sub_2c-on.gif");
		sub2d = newImage("images/sub_2d-on.gif");
		sub2e = newImage("images/sub_2e-on.gif");
		sub2f = newImage("images/sub_2f-on.gif");

		preloadFlag = true;
	}
}


/* scripts and code for navigation - Copyright (C) 2003 Greg Samson - mypants.com */

function setVisibility(objectID,state) {
	dom = findDOM(objectID,1);
	dom.visibility = state;
}

function toggleVisibility(objectID) {
	var dom = findDOM(objectID,1);
	state = dom.visibility;
	if (state == 'hidden' || state == 'hide' ) { dom.visibility = 'visible'; }
	else {
		if (state == 'visible' || state == 'show') { dom.visibility = 'hidden'; }
		else { dom.visibility = 'visible'; }
		}	
}

function makeVisible(objectID) {
	var dom = findDOM(objectID,1);
	dom.visibility = 'visible';
}

function makeHidden(objectID) {
	var dom = findDOM(objectID,1);
	dom.visibility = 'hidden';
}