So this is how it should be:

sub cleanup 
{

  return unless defined $_[0];

  $_[0]=~s/\'/\\\'/g;
  $_[0]=~s/<//g;
  $_[0]=~s/>//g;
  $_[0]=~s/;//g;
  $_[0]=~s/\(//g;
  $_[0]=~s/\)//g;
  $_[0]=~s/\"//g;
  $_[0]=~s/\'//g;
  $_[0]=~s/\?//g;
  $_[0]=~s/script//g;
  $_[0]=~s/\///g;
  $_[0]=~s/>//g;

}
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