/*
Imposes a character limit on textareas or input text fields while informing the user of how many characters
are left
Implementation:
1. include this file
2. setup the form following the below format:
	<form name="myform">
		<textarea name="limitedtextarea" onKeyDown="limitText(this.form.limitedtextarea,this.form.countdown,100);" 
		onKeyUp="limitText(this.form.limitedtextarea,this.form.countdown,100);">
		</textarea>
		
		<br>
		
		<font size="1">(Maximum characters: 100)<br>
		You have <input readonly type="text" name="countdown" size="3" value="100"> characters left.</font>
	</form>

*/

function limitText(limitField, limitCount, limitNum) {
	if (limitField.value.length > limitNum) {
		limitField.value = limitField.value.substring(0, limitNum);
	} else {
		limitCount.value = limitNum - limitField.value.length;
	}
}