function chg_src(id, src) {
   document.getElementById(id).src = src;
}

function l_over(obj) {
	chg_src(obj.id,"images/"+obj.id+"_R.jpg");
}

function l_out(obj) {
	chg_src(obj.id,"images/"+obj.id+"_O.jpg");
}

function l_ak(obj) {
	chg_src(obj.id,"images/"+obj.id+"_O.jpg");
}


function l_ov(obj) {
	chg_src(obj.id,"images/menu/Nav_"+obj.id+"_R.jpg");
}

function l_ou(obj) {
	chg_src(obj.id,"images/menu/Nav_"+obj.id+"_O.jpg");
}