//function for image rollovers	
function roll(targetImage, state) {
	//concat name of new image
	var newImage = "/common/" + targetImage.name + "-" + state + ".jpg";
	//display image
	targetImage.src=newImage;
}

//function to pre-load images
function preloadImages() {
	var imageNames = new Array("/common/home-on.jpg", 
				   "/common/services-on.jpg", 
				   "/common/company-on.jpg", 
				   "/common/careers-on.jpg", 
				   "/common/contact-on.jpg", 
				   "/common/sitemap-on.jpg");
	var imageArray = new Array();
	for (i=0; i<document.images.length; i++) {
		imageArray[i] = new Image();
		imageArray[i].src = imageNames[i]
	}
}