Javascript event problem

I am using joomla 1.5 i have MooTools files but while i am trying to submit fo开发者_如何学Crm it shows error

$(form.title).getValue() is not a function.

$(form.title) this doesn't make any sense. Not sure what are you trying to do, but if you want to get the title attribute of the form element, the code for this would be $('some-form-id').getProperty('title');

getValue() is for getting a value of a single field element, not the form.