function newImage( imgSrc ){

 	var imgName = new Image();
 	imgName.src = imgSrc;

 	return imgName;

}

function change( imgName, imgLocation )
{
 	document[imgName].src = imgLocation ;
}

var preloadFlag = false;
function loadImages()
{
 	if (document.images)
 	{
 		home_over = newImage("images/navigation/home_over.jpg");
 		products_over = newImage("images/navigation/products_over.jpg");
 		stores_over = newImage("images/navigation/stores_over.jpg");
 		employees_over = newImage("images/navigation/employees_over.jpg");
 		policies_over = newImage("images/navigation/policies_over.jpg");

 		preloadFlag = true;
 	}
}