disable options in multiselect

Hi All,
I have a multiselect drop down . At first users lets think it is "new" mode users will submit this multiselect drop down and value/values will be stored in database( I have 5 values in drop down)
now in "update" mode again users will try to submit by selecting more values from this multiselect drop down, but I want to stop and show them a alert as soon as submit all the values in the drop down , i.e out of 5 they can select upto 4 , but if they select the 5th one ,I should leave the values which came from database and I should deselect recently selected values.
 I hope I am clear.
Thanks in adavance.
prk_usaAsked:
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ManishConnect With a Mentor LeadCommented:
Iterate through selected values, check size and show alert.
ex.
http://www.ozzu.com/programming-forum/javascript-get-value-multiple-options-from-select-t88883.html
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Ryan ChongCommented:
>>i.e out of 5 they can select upto 4 , but if they select the 5th one ,I should leave the values which came from database and I should deselect recently selected values.

Why not generate a checkboxes list instead? Which i think more user friendly and easier for your scripting?
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prk_usaAuthor Commented:
Thanks for your response ryancys. but  I have existing feature as mentioned above.
 
 
 
 
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ManishLeadCommented:
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prk_usaAuthor Commented:
good
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