Error checking

[brianh]

Does anybody see why this script would not work?

<script language="JavaScript">
function calc(form)
{
var perc;
perc = Number(perc);
perc = 0;
var inputFields = document.all.tags("INPUT");
for(i=0; i < inputFields.length; i++)
  {
	if(inputFields[i].value != "")
	{
		if(inputFields[i].name != 'locID')
		{}
		if(inputFields[i].name != 'locCode')
		{}
		if(inputFields[i].name != 'org')
		{}
		if(inputFields[i].name != 'region')
		{}
		if(inputFields[i].name != 'percVal')
		{}
		if(inputFields[i].name != 'addIT')
		{}
			if(isNaN(inputFields[i].value) == true)
				{
				alert("You have input something other than a number, please input numbers only!");
				return false;
				}
			else
				{
				var num;
				alert("HI");
				num = inpurFields[i].value;
				num = Number(num);
				perc = perc + num;
				}
		}
	}
	
if(perc < 100)
{
alert("The percentages are less than 100, please check your numbers and re-submit")
return false;
}
else if(perc > 100)
{
alert("The percentages are more than 100, please check your numbers and re-submit")
return false;
}
}

</script>