Transparency/contact form problem

When my swf got a transparent background(using the publish and transparent setting) the line that flickers in inputboxes dissapears! (the line that shows where your writing…) you have to guess where your writing or if you are writing, still the letters appear…?

  1. why is this?
  2. what should I do?
  3. is there another way to use background patterns other than making the swf background transparent?
    and sorry for crappy english