function preloadActiveImage(name,src) {
	
	if(document.images[name]){
	 document.images[name].active = new Image;
	 document.images[name].active.src = src;
	}
}

function swap_high(name) {

	if (typeof(document.images[name].active)=='object') {
	      document.images[name].inactive = new Object;
	      document.images[name].inactive.src = document.images[name].src;
	      document.images[name].src = document.images[name].active.src;
	}
}

function swap_low(name) {
	
	if (typeof(document.images[name].inactive)=='object') {
      document.images[name].src = document.images[name].inactive.src;
 	}	
}