var preloaded = new Array();

function preloadImage() {
	for(var i = 0; i < arguments.length; i++)
	{
		preloaded[i] = document.createElement('img');
		preloaded[i].setAttribute('src', arguments[i]);
	}
}

function isChecked(radio) {
	var checked = false;

	for(var i = 0; i < radio.length; i++)
		if(radio[i].checked) {
			checked = true;
			break; 
		} 

	return checked;
}