$(document).ready(function(){

	for (i=0; i<=3; i++) {
		$('.hb_c_tl:eq('+i+')').css('background-image','url(/fileadmin/templates/img/r1_hb_c_tl.png)');
		$('.hb_c_tr:eq('+i+')').css('background-image','url(/fileadmin/templates/img/r1_hb_c_tr.png)');
		$('.hb_c_bl:eq('+i+')').css('background-image','url(/fileadmin/templates/img/r1_hb_c_bl.png)');
		$('.hb_c_br:eq('+i+')').css('background-image','url(/fileadmin/templates/img/r1_hb_c_br.png)');
	}

});