if (document.images) {
 
 	services_off = new Image();
   	services_off.src = "images/nav_services_off.gif";
   	services_on = new Image();
   	services_on.src = "images/nav_services_on.gif";              

 	company_off = new Image();
   	company_off.src = "images/nav_company_off.gif";
   	company_on = new Image();
   	company_on.src = "images/nav_company_on.gif";   

 	cases_off = new Image();
    cases_off.src = "images/nav_cs_off.gif";
   	cases_on = new Image();
   	cases_on.src = "images/nav_cs_on.gif";   
   	
 	resources_off = new Image();
   	resources_off.src = "images/nav_resources_off.gif";
   	resources_on = new Image();
   	resources_on.src = "images/nav_resources_on.gif";      	
   	
 	news_off = new Image();
   	news_off.src = "images/nav_news_off.gif";
   	news_on = new Image();
   	news_on.src = "images/nav_news_on.gif";      	
    
}



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

function imgOff(imgName) {
	if (document.images) {
   		document[imgName].src = eval(imgName + "_off.src")
   	}
}