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Hi there, I have 10 drop down boxes on a page where people can select some units they wish to study. Obviously people can pick more than one unit and so i want to avoid them from picking the same unit twice in each of the drop down boxes. I have looked into the disable function on drop down boxes but cannot figure out how i would go about disabling a drop down selection entry using Javascript. So far i have looked at the following jquery function below but it will not work on my php page as i do not have access to the head of the document on the platform i am on and just the body: $('select').change(function() { var ary = new Array(); $('select option:selected').each(function() { if ($(this).val().length > 0) { ary.push($(this).val()); } }); $('select option').each(function() { if ($.inArray($(this).val(), ary) > -1) { $(this).attr('disabled', 'disabled'); } else { $(this).removeAttr('disabled'); } });}); The example above is the sort of thing i am after but having studied the code, without it being in the head of the document it will not work and so it does not work when i change entry in the dropdown list. Does anybody have any modifications to the code or examples i can use to find out the values of all other dropdown's on a form and to then disable an index in the others where one is already selected on that index? Obviously i would need something to enable selections again. Even an alert box stating that the unit has already been picked and resetting back to original value would do. Many thanks, Mark

I'd like to disable certain input boxes, but without changing the HTML code manually. For example:I'd like to disable the input boxes with the following id's:id="first_field"id="fourth_field"id="sixth_field" <div> <form action=""> <fieldset> <input type="text" id="first_field"/> <input type="text" id="second_field"/> <input type="text" id="third_field"/> <input type="text" id="fourth_field"/> <input type="text" id="fifth_field"/> <input type="text" id="sixth_field"/> </fieldset> </form> </div> Anyone know a Javascript that can do this?