function formupdate(sel,txt)
{
  //if(theform == null) return;
  if (sel.value == 2)
  {
    txt.style.visibility = "hidden";
	txt.value = sel.value;
  }
  else
    txt.style.visibility = "";
}

// used to update basket entries
function chnge(id, amt)
{
  var e=document.getElementById(id);
  e.value=parseInt(e.value) + parseInt(amt);
  if (parseInt(e.value)<0)
  {
    e.value=0;
  }
}
// update main pic from thumbnail fn= filename
function updmainpic(fn)
{
  document.MainPic.src=fn;
}
// used to update shopping basket entries
function addproject( updatestr )
{
    // enter with 
  var spl = updatestr.split(","); // split string into parts
  var i=0;
  var ste="";
  var e;
  var stag="";
  for( i=0; i< spl.length ;i++)
  { 
    ste = spl[i].split("_");
	stag = "b_" + ste[0];
    e=document.getElementById(stag);
    e.value=parseInt(e.value) + parseInt(ste[1]);
  }
  e=document.getElementById('shoppinglist');
  e.submit();
}