var radios = new Array();
		
function switchimg(name, path)
{
	var img = document.getElementById("btnImg");
	img.src = path;
	img.alt = name; 
}

function checkSelected(objName, obj)
{
	obj.checked = !(radios[objName]);
	radios[objName] = obj.checked;
}

function validate()
{
	var mc = document.getElementById("maincontent");
	var inputs = mc.getElementsByTagName("input");
	for(i=0; i<inputs.length; i++)
	{ 
		if(inputs[i].checked) { return true; }
	}
	
	alert("You must select a swatch book in order to add it to your cart.");
	return false;
}