if (document.images) 
{

	
	img5on = new Image(); img5on.src = "images/nav_company_rol.gif";
	img6on = new Image(); img6on.src = "images/nav_activities_rol.gif";
	img7on = new Image(); img7on.src = "images/nav_cont_rol.gif";
	img8on = new Image(); img8on.src = "images/nav_link_rol.gif";
	

	
	
	img5off = new Image(); img5off.src = "images/nav_company.gif";
	img6off = new Image(); img6off.src = "images/nav_activities.gif";
	img7off = new Image(); img7off.src = "images/nav_cont.gif";
	img8off = new Image(); img8off.src = "images/nav_link.gif";

	
	

	var imgNow;
}

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