function initRollOverImages() {
  var image_cache = new Object();
  $("img.swap").each(function(i) {
    var imgsrc = this.src;
    var dot = this.src.lastIndexOf('.');
    var imgsrc_on = this.src.substr(0, dot) + '_on' + this.src.substr(dot, 4);
    image_cache[this.src] = new Image();
    image_cache[this.src].src = imgsrc_on;
    $(this).hover(
      function() { this.src = imgsrc_on; },
      function() { this.src = imgsrc; });
  });
}



function show(n) {
	   document.getElementById(n).style.visibility = 'visible';
}
function hide(n) {
	   document.getElementById(n).style.visibility = 'hidden';
}

function show(n) {
    var submenu_show = 'submenu' + n;
	   document.getElementById(submenu_show).style.visibility = 'visible';
	   document.getElementById(n).src='/images/newhead/menu/' + n + '.jpg';
}

function hide(n) {
    var submenu_hide = 'submenu' + n;
	   document.getElementById(submenu_hide).style.visibility = 'hidden';
	   document.getElementById(n).src='/images/newhead/menu/' + n + '.jpg';
}

function sub_show(n) {
    var submenu_show = 'submenu' + n;
	   document.getElementById(submenu_show).style.visibility = 'visible';
	   document.getElementById(n).src='/images/newhead/menu/' + n + '.jpg';
}

function sub_hide(n) {
    var submenu_hide = 'submenu' + n;
	   document.getElementById(submenu_hide).style.visibility = 'hidden';
	   document.getElementById(n).src='/images/newhead/menu/' + n + '.jpg';
}

function icon_on(n) {
    var icon_show = 'icon' + n;
	   document.getElementById(icon_show).src='/images/newhead/menu/' + icon_show + '_on.gif';
}

function icon_off(n) {
    var icon_show = 'icon' + n;
	   document.getElementById(icon_show).src='/images/newhead/menu/' + icon_show + '.gif';
}