<input type="checkbox" onclick="return false;"/>

<input type="checkbox" disabled="disabled" checked="checked">

​

<!--Just add disabled="disabled" as an attribute.-->

​

​

<!--If you want the data to be posted back, 

than a simple solutions is to apply the same name to a hidden input:-->

​

<input name="myvalue" type="checkbox" disabled="disabled" checked="checked"/>

<input name="myvalue" type="hidden" value="true"/>

​

<input type="checkbox" name="email"  disabled>