// JavaScript Document

//update value to maximum length.
	function enforceMaxLength(divID,txtObj,maxLength){
		var curLength = document.getElementById(txtObj).value.length;
		maxLength = maxLength -1;
		
		if (maxLength >= curLength)
			{document.getElementById(divID).innerHTML = 'characters remaining ' + (maxLength - curLength);}
		else
			{document.getElementById(txtObj).value = document.getElementById(txtObj).value.substr(txtObj,maxLength);}
	}
	

//check for proper characters comprising a valid positive integer. Returns True or False.
function isDigit(theDigit)
	{
		var digitArray = new Array('0','1','2','3','4','5','6','7','8','9'),j;
		
		for (j = 0; j < digitArray.length; j++)
		{if (theDigit == digitArray[j])
		return true
		}
		return false
		
	}

	function isPositiveInteger(theString){
		var theData = new String(theString)
		
		if (!isDigit(theData.charAt(0)))
		if (!(theData.charAt(0)== '+'))
		return false
		
		for (var i = 1; i < theData.length; i++)
		if (!isDigit(theData.charAt(i)))
		return false
		return true
	}