function shiftPic(img_name,img_src) {
  document[img_name].src=img_src;
}
function toggleList(e){
  element = document.getElementById(e).style;
  if(element.display == 'none'){
    element.display = 'block';
  }else{
    element.display='none';
  }
}
function popupWindow(url) {
  window.open(url,'popupWindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,copyhistory=no,width=250,height=250,screenX=150,screenY=150,top=150,left=150')
}