content input issues (cannot input any dates, eg date of birth, events dates, etc) & civicrm display issues

Hello,

I have had a website built on Drupal6 and incorporating civiCRM (version 3.1.3).

However, two main issues arose when updating the Drupal & civiCRM versions:

1) civiCRM appears 'broken', e.g. the layout is not the usual one, and when inputting new individual information, it is not possible to expand each tab individually (all must be expanded together, or all closed);

2) when inputting new contacts into civicrm, or creating events, etc, it is not possible to input any 'dates' (the box remains blank, no information would type in);

3) any modification in the crm is extremely slow -not sure if it's due to civicrm or simply to do with the site in itself...

Any help would be greatly appreciated!