Java Script Validation failed in Mozila and IE but work in Chrome & Safari

[semanticnotion]

I have problem with this code. it work in chrome and safari but in Mozila and IE when i clicked the submit button without filling the fields it will submit the form and move to other page.

function validateFormOnSubmit() {
    var checkEmpty = new Boolean(false);
    checkEmpty  = this.IsEmpty(ssn);
    //checkEmpty  = this.IsEmpty(dob);
    checkEmpty  = this.IsEmpty(lname);
    checkEmpty  = this.IsEmpty(fname);
    checkEmpty  = this.IsEmpty(middle_initial);
    checkEmpty  = this.IsEmpty(spouse_lname);
    checkEmpty  = this.IsEmpty(spouse_fname);
    checkEmpty  = this.IsEmpty(spouse_middle_initial);
    checkEmpty  = this.IsEmpty(street_no);
    checkEmpty  = this.IsEmpty(address);
    checkEmpty  = this.IsEmpty(city);
    checkEmpty  = this.IsEmpty(zip);
    checkEmpty  = this.IsEmpty(cell);
    checkEmpty  = this.IsEmpty(business_phone);
    checkEmpty  = this.IsEmpty(extention);
    checkEmpty  = this.IsEmpty(home_phone);
        if (checkEmpty == false){
            alert("alert");

            return false
        }


var emailID=document.form1.email;//this is the email address field
//alert(emailID);
if ((emailID.value==null)||(emailID.value=="")){
                alert("Please Enter your Email");
                emailID.focus();
                return false;
        }
        //alert('after checking null');
        if (echeck(emailID.value)==false){
                emailID.value="";
                emailID.focus();
                return false;
        }
   // alert("something else");

//alert("returning 44444");
   var checkInt = document.form1.ssn.value;
   //alert(checkInt.value);
   var isInt = new Boolean(true);
    isInt = this.isInteger(checkInt);
    if(isInt != true){
        return false;
    }
/*var checkZip = document.form1.zip;
  // alert(checkInt.value);
//  textfield2
   var isInt = new Boolean(true);
    isInt = this.isInteger(checkZip.value);
    if(isInt != true){
        zip.focus();
        return false;
    }
*/
}
function echeck(str) {

                var at="@";
                var dot=".";
                var lat=str.indexOf(at);
                var lstr=str.length;
                var ldot=str.indexOf(dot);
                if (str.indexOf(at)==-1){
                   alert("Invalid E-mail ID");
                   return false;
                }

                if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
                   alert("Invalid E-mail ID");
                   return false;
                }

                if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
                    alert("Invalid E-mail ID");
                    return false;
                }

                 if (str.indexOf(at,(lat+1))!=-1){
                    alert("Invalid E-mail ID");
                    return false;
                 }

                 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
                    alert("Invalid E-mail ID");
                    return false;
                 }

                 if (str.indexOf(dot,(lat+2))==-1){
                    alert("Invalid E-mail ID");
                    return false;
                 }

                 if (str.indexOf(" ")!=-1){
                    alert("Invalid E-mail ID");
                    return false;
                 }

                  return true;
        }
    function IsEmpty(fld){
        if (fld.value.length == 0) {
            fld.focus();
            alert("You have left some field empty. Please recheck & try again");
        }
        return true;

    }


function isInteger(s)
{
      var i;
        s = s.toString();
        //alert("returning");
      for (i = 0; i < s.length; i++)
      {
         var c = s.charAt(i);
         if (isNaN(c))
           {
                alert("Given value is not a number");
                return false;
           }
       //alert("returning true");
      }
      return true;
}




function trim(s)
{
  return s.replace(/^\s+|\s+$/, '');
}
</script>



<form id="form1" name="form1" method="post" action="form.php" onsubmit="return validateFormOnSubmit(this)">

[Dormilich]

are there any error messages? (I’d hazard a guess at "IsEmpty() is null or undefined")

the IsEmpty() function doesn’t make sense. it returns true in all cases.

the isInteger() function is IMO too complicated. why not checking the whole value with isNaN() or compare the value with parseInt()?

[semanticnotion]

thanks Dormilich for your response but i get the solution from bytes.com i delete that code anyway thanks for your response.