function IsInteger(sInteger)								// IsInteger()
{   var deccount = 0 ;
    var isInt = true;
    var inputStr;
    inputStr=sInteger.toString(); //in case sInteger is not a string
    for (var i = 0; i < inputStr.length; i++)
    {   var oneChar = inputStr.charAt(i);
        if (oneChar == ".")
        {	deccount = deccount + 1 ;
			if (deccount > 1) isInt = false ;
        }
        if ((oneChar < "0" || oneChar > "9") || oneChar == ".")
        {   isInt = false;
            i = inputStr.length;
        }
    }
    return isInt;
}

function IsNumeric(field)
{	var FieldValue=field.value ;
	if ((IsInteger(FieldValue)== false) || FieldValue == "") {
      alert('Please Enter Numeric Values Only');
      field.focus();
      field.select();
      return false;
  }
  return true ;
}

function CheckForm() {

if (document.contactForm.firstName.value=='') {
      alert('Please provide your First Name');
      document.contactForm.firstName.focus();
      return false;
}

if (document.contactForm.lastName.value=='') {
      alert('Please provide your Last Name');
      document.contactForm.lastName.focus();
      return false;
}

if (document.contactForm.phone.value=='') {
      alert('Please provide your Phone Number');
      document.contactForm.phone.focus();
      return false;
}

if (document.contactForm.street.value=='') {
      alert('Please provide your Street Address');
      document.contactForm.street.focus();
      return false;
}

if (document.contactForm.suburb.value=='') {
      alert('Please provide your Suburb');
      document.contactForm.suburb.focus();
      return false;
}

if (document.contactForm.city.value=='') {
      alert('Please provide your City');
      document.contactForm.city.focus();
      return false;
}

if (document.contactForm.stateName.value=='') {
      alert('Please provide your State');
      document.contactForm.stateName.focus();
      return false;
}

if (document.contactForm.postCode.value=='' || IsInteger(document.contactForm.postCode.value)==false) {
      alert('Please provide your Post Code - Numerical Values Only');
      document.contactForm.postCode.focus();
      return false;
}

return true;
}