// JavaScript Document

function preload_images(){ 
	var args = preload_images.arguments;
	document.imageArray = new Array(args.length);
	for(var i=0; i<args.length; i++){
		document.imageArray[i] = new Image;
    	document.imageArray[i].src = "images/" + args[i];
  	}
}

function set_focus(new_id){
	document.getElementById(new_id).focus();
}

function goto_url(url){
	location.href = url;
}

function open_window(url){
	window.open(url);
}

function switch_class(new_id, new_class){
	new_id.className = new_class;
}

function swap_image(new_id, new_image){
    new_id.style.backgroundImage =  "url(images/" + new_image + ")";
}