/**
 * Navigation Hover
 * @param id
 * @param option
 * @return boolean
 */
function nvHover(id,option) 
{
  if(option==1) {
    var rep=document.getElementById(id).attributes.src.value;
    cut=rep.replace("0","1");
    document.getElementById(id).src=cut;
  }
  else {
	  var rep=document.getElementById(id).attributes.src.value;
	  cut=rep.replace("1","0");
	  document.getElementById(id).src=cut;
 }
}

/**
 * SubNavigation Hover
 * @param id
 * @param option
 * @return boolean
 */
function nvSubHover(id,option) 
{
  if(option==1) {
  	menu.style.visibility="visible";
  }
  else {
  	menu.style.visibility="hidden";
 }
}