maximum word limit for textarea

<textarea rows="8" cols="28" onKeyUp="checkWordLen(this,200);"></textarea>
TOTAL WORDS : <span id="word_counter" style="color:#FF0000;">0/200</span>

function checkWordLen(obj,MaxLen)
{

var len = obj.value.split(/[\s]+/);

counter = len.length-1;

document.getElementById('word_counter').innerHTML = counter+"/"+MaxLen;

if(len.length > MaxLen)
{
objvalue = obj.value.split(/[\s]+/);

var newval = '';

for(var m=0; m<MaxLen; m++)
{
newval+=objvalue[m]+' ';
}

obj.value='';
obj.value=newval;

return false;
}

return true;
}