.NET 2.0 compatibility issue with Chrome and IE 10 - javascript

We've a .NET 2.0 website that uses Javascript to do a lot of things, such as populating drop down lists and validating pages.
users have reported some problems when they use the website with Chrome, Firefox or IE 10 or later. The problem or problems i should say are different
some drop down list don't get populated, just empty lists.
Labels are not shown, so you see a text box with no labels!
anyone had same issue before?
Thanks

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