currentPage = 1;
imagePages = 0;
function nextImages() {
    if(currentPage < imagePages) {
        unChooseDaImages(currentPage);
        currentPage++;
        chooseDaImages(currentPage);
    }
}
function prevImages() {
    if(currentPage > 1) {
        unChooseDaImages(currentPage);
        currentPage--;
        chooseDaImages(currentPage);
    }
}
function shiftDaImages(pageNo) {
    unChooseDaImages(currentPage);
    currentPage = pageNo;
    chooseDaImages(currentPage);
}
function chooseDaImages(page) {
    document.getElementById("images" + page ).style.display = "block";
    document.getElementById("shift" + page ).style.fontWeight = "bold";
    checkNextPrev(page)
}
function unChooseDaImages(page) {
    document.getElementById("images" + page ).style.display = "none";
    document.getElementById("shift" + page ).style.fontWeight = "normal";
}
function checkNextPrev(page) {
    document.getElementById("prev" ).style.visibility = "visible";
    document.getElementById("next" ).style.visibility = "visible";
    if(page == 1)
        document.getElementById("prev" ).style.visibility = "hidden";
    else if(page == imagePages)
        document.getElementById("next" ).style.visibility = "hidden"; 
}


function getURLParam(strParamName){
  var strReturn = "";
  var strHref = window.location.href;
  if ( strHref.indexOf("?") > -1 ){
    var strQueryString = strHref.substr(strHref.indexOf("?")).toLowerCase();
    var aQueryString = strQueryString.split("&");
    for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
      if ( aQueryString[iParam].indexOf(strParamName.toLowerCase() + "=") > -1 ){
        var aParam = aQueryString[iParam].split("=");
        strReturn = aParam[1];
        break;
      }
    }
  }
  return unescape(strReturn);
}