//mouseover button function
if(document.images){
	dog = new Image(); dog.src = "../images/buttons/dog_on.gif"; 
	};
	
function swap_on(imgName){
	imgName.src = "../images/buttons/" + imgName.name + "_on.gif";
	}
function swap_off(imgName){
	imgName.src = "../images/buttons/" + imgName.name + "_off.gif";
	}