I am affraid not!
Css can alter the appearance of the hovered element and or it's child element.
It cannot alter the apperance nor content of outside elements
For this you will need a bit of javascript like:
Code:
onmouseover="document.getElementById('TextBox').innerHTML='Newtext' return true"
and
Code:
onmuseout="document.getElementById('TextBox').innerHTML='' return true"
added to the image tag.