validation is not working on fire fox

[aaaaaaaaaaa]

i have used required field validaiton in validator.js,it working well on ie7 but not in
firefox.when i click on submit in firefox it not validate the field.pls help me
code used in validator.js is:

 RequiredFieldValidator.prototype = new Validator();
function RequiredFieldValidator(elementId,defaultMessage,args){
    this.elementId = elementId;
    this.args = new Array();
    this.defaultMessage = defaultMessage;
    this.messageKey = "required_field_message";
    this.validateMe = function(elementObj){
        var myValue = getValueOfElement(elementObj);
        var retValue = true;
        if(myValue == null){
            return false;
        }if(myValue.constructor == Boolean){
            if(myValue === false)
                retValue =  false;
        }else if(myValue.constructor === Array){
            if(myValue == null || myValue.length < 1)
                retValue =  false;
        }else{
            myValue = trim(myValue);
            if(myValue == null || myValue == "")
                retValue =  false;
        }
        return retValue;
    }
    this.setArgs(RequiredFieldValidator.arguments);
}

[hsriat]

Is this JavaScript?

[acoder]

Yes it is.

ax11, please use code tags when posting code. It makes it easier to read. Thanks!
Can you show how this validator is used? The calls made and how is getValueOfElement defined?

[hsriat]

Yes it is.

Ok, the 'getValueOfElement' confused me.