if (document.images) {
	n1on = new Image();    n1on.src = "images/nav-home-on.gif";
	n2on = new Image();    n2on.src = "images/nav-about-on.gif";
	n3on = new Image();    n3on.src = "images/nav-services-on.gif";
	n4on = new Image();    n4on.src = "images/nav-careers-on.gif";
	n5on = new Image();    n5on.src = "images/nav-contact-on.gif";
}

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

function imgOff(imgName) {
	if(oSrc){
		document[imgName].src = oSrc;
	}
}

function divOn(divId) {

	var d=document.getElementById(divId);
	oClass=d.className;
	d.className="side_nav_on";

}

function divOff(divId) {
	if(oClass){
		document.getElementById(divId).className=oClass;
	}
}