Javascript Validate form field for positive integers

Greetings!  I'm using the following javascript to make sure that 'totalusers' is not blank.  I'd also like to make sure that only a positive whole integer is used as a value.  How can I further validate the value in that form such that it throws a simple error message to the user is a positive whole integer is not input into the field??

function validate(form){
   
emptyText('* Please enter total number of users to be created.',document.sso_form.totalusers.value);

function emptyText(formRef,fieldName) {
    // returns false if the field contains nothing or only spaces.
    fieldName=trimSpace(fieldName);
    if(fieldName == "" || fieldName == " ") {
        error += formRef + "\n";
        return 0;
    } else {
        return 1;
    }
gmahler5thAsked:
Who is Participating?
 
mrichmonCommented:
function emptyText(formRef,fieldName) {
    // returns false if the field contains nothing or only spaces.
    fieldName=trimSpace(fieldName);
    if(fieldName == "" || fieldName == " " || IsNaN(ParseInt(fieldname)) || fieldname <= 0 ) {
        error += formRef + "\n";
        return 0;
    } else {
        return 1;
    }
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mrichmonCommented:
whoops parseInt should have only the I in Int capitalized
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mrichmonCommented:
and isNaN should have the i in is lower case.
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ZvonkoSystems architectCommented:
Your parameter names are misleading.

Try this:

function validate(theForm){
  error = "";
  checkNumber('* Please enter total number of users to be created.', theForm.totalusers.value);
  if(error!=""){
    alert("Error occured\n"+error);
    return false;
  } else {
    return true;
  }
}



function checkNumber(errMsg, theValue) {
   // returns false if the field contains nothing or only spaces.
   if(!theValue.match(/^\d+\$)) {
       error += errMsg + "\n";
       return false;
   } else {
       return true;
   }
}


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