function SwapImage(imageId) {
	if(document.getElementById) {
	  var img = document.getElementById(imageId);
	  switch (imageId) {
		case "btn_shoponline":
			img.src = (img.src.indexOf("images/btn_shoponline.png") != -1) ? "images/btn_shoponline_over.png" : "images/btn_shoponline.png";
			CloseDropdowns();
			OpenDropdown('nav_shop');
			break;
		case "btn_thecollection":
			img.src = (img.src.indexOf("images/btn_thecollection.png") != -1) ? "images/btn_thecollection_over.png" : "images/btn_thecollection.png";
			CloseDropdowns();
			OpenDropdown('nav_collections');
			break;
		case "btn_thedenimacademee":
			img.src = (img.src.indexOf("images/btn_thedenimacademee.png") != -1) ? "images/btn_thedenimacademee_over.png" : "images/btn_thedenimacademee.png";
			break;
		case "btn_about":
			img.src = (img.src.indexOf("images/btn_about.png") != -1) ? "images/btn_about_over.png" : "images/btn_about.png";
			break;
		case "btn_stockists":
			img.src = (img.src.indexOf("images/btn_stockists.png") != -1) ? "images/btn_stockists_over.png" : "images/btn_stockists.png";
			break;
		case "btn_press":
			img.src = (img.src.indexOf("images/btn_press.png") != -1) ? "images/btn_press_over.png" : "images/btn_press.png";
			break;
		case "btn_credits":
			img.src = (img.src.indexOf("images/btn_credits.png") != -1) ? "images/btn_credits_over.png" : "images/btn_credits.png";
			break;
		case "btn_contact":
			img.src = (img.src.indexOf("images/btn_contact.png") != -1) ? "images/btn_contact_over.png" : "images/btn_contact.png";
			break;
		case "btn_jointheacademee":
			img.src = (img.src.indexOf("images/btn_jointheacademee.png") != -1) ? "images/btn_jointheacademee_over.png" : "images/btn_jointheacademee.png";
			break;
		default:
			//Do Nothing
	  }
	}
	return false;
}
function OpenDropdown(menuid) {
	var dropdown = document.getElementById(menuid);
	dropdown.style.display = "block";	
}
function CloseDropdowns() {
	var dropdown = document.getElementById('nav_shop');
	dropdown.style.display = "none";
	var dropdown = document.getElementById('nav_collections');
	dropdown.style.display = "none";
}