What @andrew-jackman says is correct, but i still did a fiddle with jQuery for the kicks.
I included a hidden field to manage the data and make used jQuery's toggle to replicate the checkbox functionality
javascript
$('div#test1').toggle(function(){
$('input#hiddenfield').val('checked');
alert($('input#hiddenfield').val());
},function(){
$('input#hiddenfield').val('');
alert($('input#hiddenfield').val())
})
http://jsfiddle.net/kumiau/nPEYw/1/