Only tested in IE6.IE7 and Firefox 2. This demo doesn't require javascript and is done purely with CSS. It is unlikely to work in other browsers but I haven't bothered to test any others except Opera which will only reveal the text as long as the mouse button is held down.
This demo was purely for interests sake and to see what CSS could do.
This is some following text : this is some folowing text : This is some following text : this is some folowing text : This is some following text : this is some folowing text : This is some following text : this is some folowing text : This is some following text : this is some folowing text : This is some following text : this is some folowing text : This is some following text : this is some folowing text : This is some following text : this is some folowing text : This is some following text : this is some folowing text : This is some following text : this is some folowing text :