<!-- 
function imgOn(img_name){
	document[img_name].src= "/images/" + img_name + "_on.gif";
}
function imgOff(img_name){
	document[img_name].src= "/images/" + img_name + "_off.gif";
}

// function to preload images
// if statement checks if the image has a 'name' attribute
// only images with a name have the _on version. All other
// images will not be swapped.
function preLoad(){
	for(i=0; i<document.images.length;i++){
		 var a = new Image();
		 var img = document.images[i].name;
		 if(img != "" && img !=null){
		 	a.src="/images/" +img+"_on.gif";
		}
	}
}
	
// -->