function CSSchec() {

if (screen.height <= 600){
CSSstil="<LINK rel='stylesheet' type='text/css' href='http://www.heiltor.de/CSS/style_tiny.css'>";
 }
if (screen.height <= 768){
CSSstil="<LINK rel='stylesheet' type='text/css' href='http://www.heiltor.de/CSS/style_smal.css'>";
 }
else  if(screen.height <= 864){
CSSstil="<LINK rel='stylesheet' type='text/css' href='http://www.heiltor.de/CSS/style_mid.css'>";
 }
else
{

CSSstil = "<LINK rel='stylesheet' type='text/css' href='http://www.heiltor.de/CSS/style_big.css'>";
 }
}