function kropklas(x)
{
document.write("<style>");
document.write("body.klassen");
document.write("{");
	document.write("font-family: 'Comic Sans MS';");
	document.write("font-size: small;");
	document.write("color: #000000;");
	document.write("background-color: transparent;");
	document.write("background-image: url("+x+");");
	document.write("background-repeat: no-repeat;");
	document.write("background-position: center;");
	document.write("background-attachment: fixed;");
document.write("}");
document.write("</style>")
}