var maxLength = 300;

function commentskeys(input)
{
	var i = input.value.length;
	
	refreshCount(input, i + 1);
	
    return true;
}

function refreshCount(input, k)
{
    var cl = (maxLength - input.value.length);
    
    if (k) { cl = (maxLength - k); }
    
    if (input.value.length > maxLength) {
        input.value = input.value.substr(0, maxLength);
    }

	document.getElementById('charsleft').innerHTML =
		cl + ' Characters Remaining';
}