javascript - how can I change the label name when the option value change? -

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i have combo box , values 1 , 3 inside combobox. when page loads default value 1 , default label name 1.... if select 2 on combo box make label name 2.

function changelabel(){  if (document.getelementbyid('conbobox').value !=1) {document.getelementbyid('mylabel').label="2"} }

i can't see markup, assume element id 'mylabel' div labeling combobox element. if case, use 

document.getelementbyid('mylabel').innerhtml = "2"

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