How could I realize a button which is turned 90° to the right or to the left by default? I dont want to let him turn onClick, but he should be already turned when the page is loading?
Additionally how could I position this button in a vertical center rightsided to a grid?
Like this:

Thanks,
zY
DEMO FIDDLE
a fix for IE would be replacing the div with an image or just set a separate css playing around with the button styles.
As the OP asked ‘…Argh! please… make it work in IE!?…’ 😉 here is an example on how to do that:
DEMO FOR IE 8,7,(and believe it or not) 6!
Just add to the previous code – and modify for your needs the ‘px’ to best position the DIV
ONE ONLY THING… (sad but true)
The IE DX filter only permits 4 stages of rotation (1,2,3,4) , so you won’t be able to rotate an element by a fancy degreed position like 37° or doing like :
BasicImage(rotation=2.3).