Webmaster Forum / HTML, CSS, Scripts / JavaScript / May 2006

Can someone look at this code and tell me what is wrong? The error
message says "Line 8 Char 1 'dealerId' is undefined" But I thought that
I stated everything correctly. Do I have any syntax errors in here. The
code is supposed to display an alert if someone typed in letters
instead of numbers for each input box.
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<script>
function validateInputs() {
var validInputs=(IsValidNumber(dealerId,DealerID)
                &&IsValidNumber(seriesId,SeriesID)
                &&IsValidNumber(modelId,ModelID)
                &&IsValidNumber(extColorId,ExteriorColorID)
                &&IsValidNumber(fabricTypeId,FabricTypeID));
    if(!validInputs){
        return false;
    }
}
function IsValidNumber() {
var input = document.getElementById(inputId);
    if(!validateNumber(input,inputDescription)){
        return false;
    }else{
        return true;
    }
}

var re = /^\d+$/;
function validateNumber(input, inputName) {
    var validNumber = re.exec(input.value);

    if (!validNumber) {
        alert("Input a valid number in " + inputName + " now!");
        input.focus();
        return false
    } else {
        return true;
    }
}
</script>

html:
<form id="Form1" action="DisplayMultipleProcedures.aspx" method="post"
onsubmit="return validateInputs();">
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Thanks :)