Round textbox input to nearest thousand

I have a form which uses client side calculation, onblur(). I need to round the user input to the nearest thousand, for example if the user enters 550 then it must be rounded to 1000 or if the user enters 1200 then rounded to 1000. Is there any way to do this?
jerseybelleAsked:
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GwynforWebCommented:
<input onblur="this.value=1000*Math.round(this.value/1000)">
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