function hi_lght(n) {
	img_hi_lght(n);
	lig_hi_lght(n);
}

function img_hi_lght(n) {
	elem =document.getElementById('i'+n);
	elem.src="img/f_hi.png";
}

function lig_hi_lght(n) {
	elem =document.getElementById('R'+n);
	elem.className="hi_lght";
}

function lo_lght(n) {
	img_lo_lgth(n);
	lig_lo_lght(n);
}


function img_lo_lgth(n) {
	elem =document.getElementById('i'+n);
	elem.src="img/f_lo.png";
}

function lig_lo_lght(n) {
	elem =document.getElementById('R'+n);
	elem.className="";
}

function disp(elem) {
  obj=document.getElementById(elem);
  if (obj.style.display =="none") 
    obj.style.display="";
  else
    obj.style.display="none";
}