Saludos
Código PHP:
<html>
<head>
<style>
.miclase {
background-color: #FFFFFF;
color:#000000 ;
}
</style>
</head>
<body>
<select id=combo1>
<option>contenido1</option>
<option>contenido2</option>
<option>contenido3</option>
</select>
<select id=combo2>
<option>contenido4</option>
<option>contenido5</option>
<option>contenido6</option>
</select>
<input name="radiobutton" type="radio" value="radiobutton">
<input type="checkbox" name="checkbox" value="checkbox">
<br>
<br>
<a href="javascript:disable();">disable</a>
<a href="javascript:enable();">enable</a>
</body>
</html>
<script language="javascript">
function disable() {
var combo1 = document.getElementById('combo1');
var combo2 = document.getElementById('combo2');
var radiobutton = document.getElementById('radiobutton');
var radiobutton = document.getElementById('checkbox');
combo1.disabled = true;
combo1.className = "miclase";
combo2.disabled = true;
combo2.className = "miclase";
radiobutton.className = "miclase";
checkbox.disabled = true;
checkbox.className = "miclase";
}
function enable() {
var combo1 = document.getElementById('combo1');
var combo2 = document.getElementById('combo2');
var radiobutton = document.getElementById('radiobutton');
combo1.disabled = false;
combo1.className = "";
combo2.disabled = false;
combo2.className = "";
radiobutton.disabled = false;
radiobutton.className = "";
checkbox.disabled = false;
checkbox.className = "";
}
</script>