Execute jquery in if statement

I got a login system, and what I want to do is to hide a div and show another div when the user types the incorrect login details. However it doesn't seem to work.

if(...) { // here I check if the user enters the correct information

... //much code inside

} else { // if incorrect info, do this
    echo "<script>$('#jqueryhide2').hide();
        $('#jqueryhide').show();</script>";
}

Tried to google a bit but can't find anything that could solve my problem.