I got this code in my submit form

<form id="myform" action='hello.php' method='GET'>
    <input type="button" name="newWin" onclick="frmSubmitSameWindows();">
    <input type="button" name="SameWin" onclick="frmSubmitNewWindows();">
<form>

Then use some js functions in the head;

function frmSubmitSameWindows() {
form.target = '';
form.submit();
}


function frmSubmitNewWindows() {
form.target = '_blank';
form.submit();
}

What is the pro and cons when we use javascript event function such as frmSubmitSameWin() and frmSubmitNewWin() in our form ? as far as i concern, this is the best solution when we need a way to submit things. Is there other preference ? the better way then the way i got now ?