function checkPhone(areaCode,part1,part2,ext)
{
	var i = 1;
	var areaCodeValue = areaCode.value;
	var areaCodeValueLength = areaCode.value.length;
	var part1Value = part1.value;
	var part1ValueLength = part1.value.length;
	var part2Value = part2.value;
	var part2ValueLength = part2.value.length;
	var extValue = ext.value;
	var extValueLength = ext.value.length;

	if (isNaN(areaCodeValue) || (areaCodeValueLength < 3) )
	{
		window.alert("AreaCode should be a three digit number.");
		areaCode.focus();
		return false;
	}				
					
	if (isNaN(part1Value) ||  (part1ValueLength < 3))
	{
		window.alert("Please enter a three digit number in this box.");
		part1.focus();
		return false;
	}				

	if (isNaN(part2Value) ||  (part2ValueLength < 4))
	{
		window.alert("Please enter a four digit number in this box.");
		part2.focus();
		return false;
	}				

	if (extValueLength > 0)
		if (isNaN(extValue))
		{
			window.alert("Please enter numbers in this box.");
			ext.focus();
			return false;
		}				

    return true;
}