User submitting into a javascript file

Is it possible for the user to input text into a form on a site and for that text to be put into a javascript "quotes" file which will then display that text on a page?

So, for instance, you've got this .js file uploaded

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var quotes=new Array()

quotes[0]='Text1'

quotes[1]='Text2'

var whichquote=Math.floor(Math.random()*(quotes.length))
document.write(quotes[whichquote])

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Could a user input Text3 into a form and it appears in the .js file as -

quotes[2]='Text3'

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and so on?

Can't be done with javascript as far as I know. You'll need to use a serverside language, such as php or asp.