function ValidateRequiredField(field, fieldName)
    {
        if (field.value == "")
        {
            alert('Required information is missing: ' + fieldName);
            field.focus();
            field.select();
            return false;
        }
        return true;
    }
    

 function ValidateNumericField(field){
    var fieldValue = field.value;

    if(fieldValue != null && fieldValue != '' && isNaN(fieldValue)){
        alert('Value must be numeric.');
        field.focus();
        field.select();
        return false;
        }
    return true;
    }