html - Can't get javascript to calculate string length -

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i have form 1 below, , i'm trying calculate string length of inserted user value javascript. 

<form class="newcomment" method="post" id="formcourse1" name="commentadd">     <textarea class="scrollwelcome" id="text"  rows="4" cols="65" name="course1"  placeholder="ciao <?php print($name); ?>! inserisci qui il tuo commento"></textarea>     <input type="submit" id="button" name="submit" value="manda">

i've been trying code can't work, won't go if statement. help? thank you

function commentlength() {     address = oform.elements["course1"].value;     var length = address.length;     if (length==1) {         document.getelementbyid("lengtherror").innerhtml = "one character";     }      if (length<5 & length>1) {         document.getelementbyid("lengtherror").innerhtml = "several characters";     }      return false; }

you may try (length<5 && length>1) (two ampersands) in if clause.


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