I just use duct tape and when I take it down I simply stick it to the back of our schoolroom door. I haven't even had to replace the tape yet. I'm sure everyone once in awhile I'll need to. Like I said, not pretty but works great! We use it for spelling rules, verses to copy, brain storming... all sorts of "stuff". The added bonus is you can put your one year old up on a chair next to you and give her an eraser! As I teach and write I'll lean over and scribble on the other side of the slider or write letters and she'll erase them. Keeps her entertained forever!
I'm sure I am NOT the first one to figure this out but it was so helpful to me I had to share!