function set_alpha(elementId, alphaVal) {
		obj = document.getElementById(elementId);
/*!IE*/	if(navigator.appName != "Microsoft Internet Explorer")
			obj.style.opacity = alphaVal;
		else
			obj.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity=' + alphaVal * 100 + ')';
	}
	
	function swap_img(elementId, url) {
		obj = document.getElementById(elementId);
		obj.src = url;
	}