function
	setstyle(whom, key, val) {
		getref(whom).style[key] = val;
	}

	function
	getref(obj) {
		return (typeof obj == "string") ?
             	document.getElementById(obj) : obj;
	}

	function
	chg_but_style(color, whom) {
		setstyle(whom, 'background', color);
	}