function slugify(st) {
	st = st.toLowerCase();
	st = st.replace(/ /g,"-");
	st = st.replace(/ą/g,"a");
	st = st.replace(/ć/g,"c");
	st = st.replace(/ę/g,"e");
	st = st.replace(/ł/g,"l");
	st = st.replace(/ń/g,"n");
	st = st.replace(/ó/g,"o");
	st = st.replace(/ś/g,"s");
	st = st.replace(/ź/g,"z");
	st = st.replace(/ż/g,"z");
	st = st.replace(/[^a-zA-Z0-9\-]/g, "");
	return st;
}