function aproove(id) {
	if (document.getElementById(id).value == "1"){
		document.getElementById(id).value == "0";
	} else {
		document.getElementById(id).value == "1";
	}
	alert(document.getElementById(id).value == "1");

}

and in document I have 

<input class="forum" type="checkbox" name="R1[17]" value="ON" onclick="aproove('HR1_17');" checked>&nbsp;
<input type="hidden" id="HR1_17" name="HR1[17]" value="0">