ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false
 
aboutUs_off			= new Image();
aboutUs_off.src		= "/images/rollovers/home/aboutUs_off.gif";
aboutUs_on			= new Image();
aboutUs_on.src		= "/images/rollovers/home/aboutUs_on.gif";

asphalt1_off		= new Image();
asphalt1_off.src	= "/images/rollovers/subpages/asphalt1_off.gif";
asphalt1_on			= new Image();
asphalt1_on.src		= "/images/rollovers/subpages/asphalt1_on.gif";

asphalt2_off		= new Image();
asphalt2_off.src	= "/images/rollovers/subpages/asphalt2_off.gif";
asphalt2_on			= new Image();
asphalt2_on.src		= "/images/rollovers/subpages/asphalt2_on.gif";

asphalt3_off		= new Image();
asphalt3_off.src	= "/images/rollovers/subpages/asphalt3_off.gif";
asphalt3_on			= new Image();
asphalt3_on.src		= "/images/rollovers/subpages/asphalt3_on.gif";

asphalt4_off		= new Image();
asphalt4_off.src	= "/images/rollovers/subpages/asphalt4_off.gif";
asphalt4_on			= new Image();
asphalt4_on.src		= "/images/rollovers/subpages/asphalt4_on.gif";

contactUs_off		= new Image();
contactUs_off.src	= "/images/rollovers/home/contactUs_off.gif";
contactUs_on		= new Image();
contactUs_on.src	= "/images/rollovers/home/contactUs_on.gif";

links_off			= new Image();
links_off.src		= "/images/rollovers/home/links_off.gif";
links_on			= new Image();
links_on.src		= "/images/rollovers/home/links_on.gif";

products_off		= new Image();
products_off.src	= "/images/rollovers/home/products_off.gif";
products_on			= new Image();
products_on.src		= "/images/rollovers/home/products_on.gif";

services_off		= new Image();
services_off.src	= "/images/rollovers/home/services_off.gif";
services_on			= new Image();
services_on.src		= "/images/rollovers/home/services_on.gif";

var currentImg = "";
ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false

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

function img_inact(imgName) 
{
	if(currentImg != imgName)
	{
        imgOff = eval(imgName + "_off.src");
        document [imgName].src = imgOff;
    }
}

function img_sel(imgName)
{
	temp = currentImg;
	currentImg = imgName;
	
	if(temp != "")
		img_inact(temp);
}