function change_theme_to_blue(){
	document.getElementById('theme').value=0;
	document.getElementById('theme_form').submit();
}
function change_theme_to_ferrari(){
	document.getElementById('theme').value=1;
	document.getElementById('theme_form').submit();
}
function change_theme_to_airplane(){
	document.getElementById('theme').value=2;
	document.getElementById('theme_form').submit();
}
function change_theme_to_motorbike(){
	document.getElementById('theme').value=3;
	document.getElementById('theme_form').submit();
}
function change_theme_to_sailing(){
	document.getElementById('theme').value=4;
	document.getElementById('theme_form').submit();
}