<input type="checkbox" onClick="document.getElementById('gruzsep').disabled = (this.checked) ? false : true ;" checked="true"/>
<li><input type="checkbox" onClick="document.getElementById('gruzsep').disabled=(this.checked)?false:true;" id="gruzchk" checked="true"/>Разделитель 1<br/><input type="text" id="gruzsep" value=","/></li>
<input type="checkbox" onchange="this.nextElementSibling.disabled = this.checked;"> <input type="text">
<html> <head> </head> <body> <input type="checkbox" onchange="this.nextElementSibling.disabled = this.checked;"> <input type="text"> <input type="checkbox" onchange="this.nextElementSibling.disabled = !this.checked" checked = "true"> <input type="text"> </body> </html>
