function build_menu(eID)
{
  if (document.all&&document.getElementById)
  {
    navRoot = document.getElementById(eID);
    for (i=0; i<navRoot.childNodes.length; i++)
	{
      node = navRoot.childNodes[i];	  
      if (node.nodeName=="LI")
	  {
        node.onmouseover = function() {
          this.className+=" over";
        } 		
        node.onmouseout=function() {
          this.className=this.className.replace(" over", "");
        }
      }
    }
  }
}

initMenu = function()
{
  build_menu("nav1");
  build_menu("nav2");
  build_menu("nav3");
  build_menu("nav4");
}

window.onload=initMenu;

function computeForm(form) {

calcrate = (form.basictax.value / (100 - form.basictax.value))+1;
money= 100 * form.donation.value * calcrate;
money= (Math.round(money))/100;
form.amount.value = money

highrate = 40
claimback = 100* money * ((highrate - form.basictax.value)/100);
claimback= (Math.round(claimback))/100;
form.highrec.value=claimback

}
var images=new Array()
function preloadimages(){
for (i=0;i<preloadimages.arguments.length;i++){
images[i]=new Image()
images[i].src=preloadimages.arguments[i]
}
}
preloadimages("http://www.walcuk.org.uk/images/buttons/home.gif","http://www.walcuk.org.uk/images/buttons/aboutroll.gif","http://www.walcuk.org.uk/images/buttons/acamroll.gif","http://www.walcuk.org.uk/images/buttons/shopoll.gif","http://www.walcuk.org.uk/images/buttons/whoroll.gif")