javascript validation error - HALP!1 :(

Can someone please suggest to me why this validation works in Google Chrome and IE6 and doesn't work in Firefox?!

[php]
function checkData(frm)
{
if(!CheckEmpty(pd.name.value,"Name"))
{
pd.name.focus();
return false;
}
if(!CheckNumber(pd.phone.value,"Phone Number"))
{
pd.phone.value='';
pd.phone.focus();
return false;
}
if(!CheckEmpty(frm.email.value,"Email Address"))
{
frm.email.focus();
return false;
}
if(!CheckEmailAddr(pd.email.value,"Email Address"))
{
alert("Invalid Email Address");
pd.email.value='';
pd.email.focus();
return false;
}
if(isNaN(document.pd.frmRetirementAge.value))
{
alert("Retirement Age should be Numeric");
pd.frmRetirementAge.value='';
pd.frmRetirementAge.focus();
return false;
}
if(isNaN(document.pd.frmNetGrowthRate.value))
{
alert("Net growth rate should be Numeric");
pd.frmNetGrowthRate.value='';
pd.frmNetGrowthRate.focus();
return false;
}
if(isNaN(document.pd.frmEscalation.value))
{
alert("Premium Escalation should be Numeric");
pd.frmEscalation.value='';
pd.frmEscalation.focus();
return false;
}
if(isNaN(document.pd.frmInflation.value))
{
alert("Inflation should be Numeric");
pd.frmInflation.value='';
pd.frmInflation.focus();
return false;
}
if(isNaN(document.pd.frmAge.value))
{
alert("Current Age should be Numeric");
pd.frmAge.value='';
pd.frmAge.focus();
return false;
}
if(isNaN(document.pd.frmValueOfExisitingFunds.value))
{
alert("Value Of Existing Funds should be Numeric");
pd.frmValueOfExisitingFunds.value='';
pd.frmValueOfExisitingFunds.focus();
return false;
}
if(isNaN(document.pd.frmPensionRequiredInTodaysTerms.value))
{
alert("Pension Required should be Numeric");
pd.frmPensionRequiredInTodaysTerms.value='';
pd.frmPensionRequiredInTodaysTerms.focus();
return false;
}
if(isNaN(document.pd.frmContribution.value))
{
alert("Monthly Contribution should be Numeric");
pd.frmContribution.value='';
pd.frmContribution.focus();
return false;
}
testForm()
}
[/php]