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javascript - Get name of form element

i have this simple JS for validating form, can someone tell me how to get name of field (you know, name=""), it should be where NameOfSomefield is now :S I tried with someField.tagName but no luck...

function validateForm(){
    var someField = document.forms["nameofofrm"]["someField"].value;
    if (someField==null || someField=="") {
        alert("You cannot leave blank this field: ".NameOfSomefield);
        return false;
    }
}
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var name = element.getAttribute("name");

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