function showHide(elementID){
var element = document.getElementById(elementID)
if (element.style.display == "block") element.style.display = "none"
else element.style.display = "block"
}
function hideShow(elementID){
var element = document.getElementById(elementID)
if (element.style.display != "none") element.style.display = "none"
else element.style.display = "block"
}
function swapBriefFull(elementName){
   var full_element = document.getElementById(elementName + "_full");
   var img_element = document.getElementById(elementName + "_img");
   hideShow(elementName + "_brief");
   showHide(elementName + "_full");
   if (full_element.style.display == "none")
      img_element.alt = "Click to read more"
   else
      img_element.alt = "Click to hide"
   
}

function expandCollapse(elementName) {
   var full_element = document.getElementById(elementName + "_full");
   var img_element = document.getElementById(elementName + "_img");
   showHide(elementName + "_full");
   if (full_element.style.display == "none")
      img_element.alt = "Click to read more"
   else
      img_element.alt = "Click to hide"
   
}

function zoomBook(BookID) {
   var hfBookID = document.getElementById("hfBookID");
   hfBookID.value = BookID;
   __doPostBack('lbHidden','');
}

function changeBasket(cbID, BookID) {
//   alert(" 1; cbID =" + cbID + "; BookID =" + BookID);
   var hfBookBag = document.getElementById("hfBookBag");
//   alert(" 2;");
   var cb = document.getElementById(cbID);
   var currentBag = hfBookBag.value;
//   alert(" 3; currentBag="+currentBag);
   var newBag = currentBag;
//   alert(" 4;");
   var pattern = new RegExp("<"+BookID+">");
   
//   alert(" 5;");
   newBag = newBag.replace(pattern, "");
//   alert(" 6; newBag="+newBag);
   if (cb.checked) {
      newBag = newBag + "<" + BookID + ">";
   }
//   alert(" 7; newBag="+newBag);
   hfBookBag.value = newBag;
//   alert(" 8; new value="+hfBookBag.value);
   
}